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several同义词辨析
a few、a number of、several、some都有“一些”的'意思，具体用法如下：
a few adj. 一些，几个。在数量上用于肯定意义，强调有一些，后接复数可数名词。
a number of 许多，若干。强调数量的概念，也可说 a large/small number of，后接复数可数名词，谓语动词用复数。
several det./adj. 几个，数个。相对于a few，some而言较为正式，一般只能用于肯定句，强调“不止一两个”，后接复数可数名词。
some adj. 一些，若干。带有不确定性，多用于肯定句中，后接复数可数名词或不可数名词。
Occurrence and volatility of several trace elements in pulverized coal boiler
Abstract：The contents of eight trace elements(Mn, Cr, Pb, As, Se, Zn, Cd, Hg) in raw coal, bottom ash and flyash were measured in a 220 t/h pulverized coal boiler. Factors affecting distribution of trace elements wereinvestigated, including fly ash diameter, furnace temperature, oxygen content and trace elements' characters. Onecoefficient of Meij was also improved to more directly show element enrichment in combustion products. Theseelements may be classified into three groups according to their distribution: Group 1: Hg, which is very volatile.Group 2: Pb, Zn, Cd, which are partially volatile. Group 3: Mn, which is hardly volatile. Se may be locatedbetween groups 1 and 2. Cr has properties of both group 1 and 3. In addition, the smaller diameter of fly ash, themore relative enrichment of trace elements( except Mn). The fly ash showed different adsorption mechanisms oftrace elements and the volatilization of trace elements rises with furnace temperature. Relative enrichments of traceelements(except Mn and Cr) in fly ash are larger than that in bottom ash. Low oxygen content can not alwaysimprove the volatilization of trace elements. Pb is easier to form chloride than Cd during coal combustion. Traceelements should be classified in accordance with factors.作 者：HUANG Ya-ji Jin Bao-sheng ZHONG Zhao-ping XIAO Rui TANG Zhi-Yong REN Hui-feng 作者单位：HUANG Ya-ji,Jin Bao-sheng,ZHONG Zhao-ping,XIAO Rui,TANG Zhi-Yong(Education Ministry Key Laboratory on Clean Coal Power Generation and Combustion Technology, Southeast University, Nanjing 210096, China)REN Hui-feng(Thermoelectric Power Plant of Yangzi Petrochemical Co. , Nanjing 210002, China)
期 刊：环境科学学报(英文版) ISTICSCI Journal：JOURNAL OF ENVIRONMENTAL SCIENCES 年，卷(期)：, 16(2) 分类号：X784 Keywords：occurrence volatility relative enrichment trace element group of elementsShe dashed in from the garden.
她从花园里猛冲进来。
Only a mad dash got them to the meeting on time.
他们一阵狂奔，总算准时到达会场。
I must dash, I'm late.
我得赶紧走，来不及了。
He cut quite a dash in his uniform.
他穿着这身制服显得特帅。
The rug adds a dash of colour to the room.
小地毯为房间增添了一点色彩。
The boy dashed out into the road.
男孩子向路中间冲去。
I dashed off a note to my brother.
我急急忙忙给我弟弟写了个字条。
▼grasp是什么意思
作名词：
控制;控制力;能力所及
作动词：
抓住;了解;急忙抓住
▼grasp的英语音标
英 [ɡrɑ:sp] 美 [ɡr?sp]
▼grasp的时态
现在分词： grasping
过去式： grasped
过去分词： grasped
▼grasp的英语例句
1. He let the ball slip through his grasp and into the net.
球从他的掌中滑出，钻进了球门。
2. His hand was taken in a warm, firm grasp.
他的手被热情地紧紧握住了。
3. Attlee was extremely intelligent and his grasp of the situation was masterly.
阿特利聪明过人，对局势的把握颇为高明。
4. I know that you'refloundering around, trying to grasp at any straw.
我知道你正不知所措，是在病急乱投医。
5. The people in your grasp are not guests, they are hostages.
你所控制的这些人不是客人，而是人质。
6. The immensity of the universe is difficult to grasp.
宇宙的浩瀚难以捉摸。
7. The students had a grasp of decimals, percentages and fractions.
学生们掌握了小数、百分数和分数。
8. She allowed victory to slip from her grasp.
她让胜利从手中溜走了。
9. They have a good grasp of foreign languages.
他们外语掌握得很好。
10. The hammer slipped out of her grasp.
锤子从她的手中滑落。
11. Peace is now within our grasp.
现在和平在望。
12. The bag was wrenched from her grasp.
那只包从她紧握的手里被夺了出来。
13. We have no intuitive grasp of the immensity of time.
我们对时间的无限没有什么直观的认识.
14. It's difficult to grasp the sheer enormity of the tragedy.
很难确切知道这场悲剧的严重程度.
15. I can't quite grasp the meaning of these figures.
我不能很好地领会这些数字的重要性.
例句：
Its brain is small in relation to its body.
和它的身体相比，它的大脑很小。
The mind needs exercise as well as the body.
大脑同身体一样需要锻炼。
In her body a new life was taking form.
一个新的`生命在她的体内逐渐形成。
The body was cold and showed no signs of life.
那躯体冰凉，显现不出有生命的迹象。
The cancer cells may invade other parts of the body.
癌细胞可能扩散到身体的其他部位。
vt. 离开;遗弃;忘了带;交托
vt.& vi. 离去;出发;舍弃;
n. 准假;假期;辞别;许可
一、作“留下”、“丢下”、“落下”,常表示某物落在/忘在某地。
如:
You'd better leave your address and telephone number.
你最好留下你的地址和电话号码。 Bettertakeoffyourshoesandleavethemoutside.
最好把鞋脱掉,放在外面。
I left my key in the readingroom.
我把钥匙忘在阅览室了。
二、 表示“留给”、“交给”,一般与介词with或to搭配。如:
Leave it with / to me and I'll see what I can do.
把它交给我,我就知道该怎么办。
He has left a number of books with / to me.
他把好些书都存在我这儿/留给了我。
We didn't find him and left word (或a message) with his neighbours. ??我们没找到他,于是就托他的邻居留了个条。(不用to,因为便条还要交给别人) ??
注意: leave sth with sb, 表示“暂存”,以后还要取回。leave sth to sb, 表示以后不再索还。
三、 leave作使役动词,表示“使/ 让……保持某种状态”。
① 用形容词作宾语补足语
Leave the door open when you go out.
出去时,不要关门。
His illness left him very weak.
他生病以后,身体很虚弱。
② 用不定式作宾语补足语
Leave him to do it himself.
让他自个儿去做。
They killed the bison, cut off the skins and left the bodies to rot. ?他们把野牛杀死剥皮,尸体就任其腐烂。
What we've done leaves much to be desired.
我们的工作还有很多不足之处。
③ 用现在分词作宾语补足语
They walked off and left me sitting there alone.
他们走开了,让我一个人坐在那儿。
He went out, leaving his papers lying open on the desk.
他出去时,把他的文件摊在桌子上。
④ 用过去分词作宾语补足语
Did you leave the doors and windows properly fastened?
你把门窗关好了吗?
He left a few questions unanswered.
他还有些问题没有作答。
⑤ 还可用名词、介词短语等作宾语补足语
His parents both died last year, leaving him an orphan. ??他父母去年双双去世,留下他成为一个孤儿。
He left his schoolbag on the playground. 他把书包丢在操场上了。
四、 leave的过去分词left,常用作后置定语,表示“剩下的”。如:
I've got two tickets left for tonight's film.
今晚的电影票我有多余的两张。
Is there any water left in the bottle?
瓶子里还有水吗?
五、 leave还可作名词,表示“休假”、“假期”。如:
I have 3 weeks'leave.
我有三个星期休假。
My best friend, Joan is spending her leave in Beijing.
我最好的朋友琼正在北京度假。
He asked his teacher for sick leave.
他向老师请病假。
leave for
动身去..., 前往..., 到...去
leave out
忽略, 不考虑;漏掉, 遗漏
leave it at that
别再说了, 到此为止, 就这样算了
leave it out
(让人停止做某事)行啦, 就这样吧
take leave of your senses
丧失理智, 发疯
without a by your leave
擅自;未经许可;粗鲁地, 无礼地
without so much as a by your leave
擅自;未经许可;粗鲁地, 无礼地
sick leave
病假
leave off
中断;放弃;结束
French leave
不辞而别;擅自缺席
shore leave
登岸假
leave well alone
不要去管它;不要画蛇添足
ticket of leave
假释许可证
leave school
毕业;离校;辍学
take it or leave it
要就要;不要拉倒
leave the door open
将门敞开;确保还有机会
leave much to be desired
远不能令人满意;极不完善
leave a mark
留下深远的影响
compassionate leave
私事假
with your leave
如蒙许可;如果您同意;道歉
1. It got to the point where he had to leave.
到了他不得不走的地步。
2. One more question and I'll leave you in peace.
再问一个问题，我就不打扰你了。
3. I had to admire David's vow that he would leave the programme.
戴维发誓要离开这个项目，我不得不对他表示钦佩。
4. Our cars get blocked in and we can't leave for ages.
我们的车被堵在里面，要等很久才能走。
5. I do hope you'll forgive me but I've got to leave.
我真的非常抱歉，我得走了。
6. Don't leave a child alone in a room with an open fire.
房间里有裸露的明火时，不要让孩子独处其中。
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