join in 参加，加入
Do you know how many of them joined in the research project?你知道他们中间有多少人参加了这个研究项目吗？
just now 刚才，不久;现在，眼下
Paul telephoned just now.
保罗刚才打来了电话。
keep an eye on 留意，照看
Our neighbours keep an eye on the house while we're away.我们外出的时候，邻居给我们照看房子。
keep in mind 记住，不忘记
We must keep these lessons of history firmly in mind.我们必须牢记这些历史的教训。
keep one's word 遵守诺言，守信
He never keeps his word.他从不信守诺言。
keep to 坚持;退守，遵循
Keep to your task till you've finished.要坚持你的工作直到完成为止。
keep up with 与......同步，跟上
We must keep up with times.我们必须跟上时代。
knock down 击倒，撞倒
He knocked down the bottle with carelessness.他不小心撞倒了瓶子。
lay aside 把......搁置起来，积蓄
He lays aside an hour a day for reading.
他每天抽出一小时来看书。
lay dowm 放下，制定
The general told the troops to lay down their arm.将军命令军队放下武器投降。
lay out 展开 布置，设计
Jim's dinner jacket was already laid out on the bed.吉姆的晚礼服已经摆在床上了。
learn......by heart 记住......，背熟，默记
You should learn all the new words by heart.你应该把所有的生词都背下来。
leave alone 不管，不理会，不干扰
Leave the dog alone or he'll bit you.
不要惹那条狗，不然它会咬你的。
leave behind 留下，忘记带走
Take care not to leave your keys behind.
留心别忘了带钥匙。
leave out 省去，略去;遗漏
If you can't think of the answer to the question,leave It not.假如你想不出那个问题的答案，就略而不答。
let alone 更不用说
The baby can't even walk,let alone run.
这个婴儿连走路都不会，更不用说跑了。
let off 放(炮，烟火等)
Small boys are letting fireworks off.
小男孩们正在放花炮。
let out 放出，发出
He has got so fat that he'll have to let the coat out several inches.他长得太胖了 将不得不把衣服放出几英寸。
lie in 在于
Happiness lies in contentment.知足常乐
lie on 取决于;是......的责任
It lies on the eldest son to make provision for his aged father.赡养年迈父亲的责任落在长子身上。
live on 继续活着;以......为主食;靠......生活
We live on our salary.我们靠工资度日。
live through 度过;经受住
I couldn't live through another day like this.这样的日子我一天也熬不下去了。
live up to 不辜负，无愧于
The hotel didn't live up to its great name.
这家族馆有愧于它的盛名。
long bofore (很久)以前
I knew George long before I knew you.
我早在认识你之前就认识了乔治。
long for 渴望
People are longing for peace.人们渴望和平
look after 照顾;暂时负责，照看
I hope you will look after my luggage properly.我希望你能好好照看我的行李。
look for 寻找;期待，预料
We are looking for new water sources.
我们正在物色新水源。
look forward to 希望，盼望，期望
We are looking forward to seeing you again.我们盼望能与你再次相会。
look into 调查;研究;了解
The police are looking into the matter.
警察正在调查此事。
look on 旁观，观望
They stood looking on while the woman was robbed.他们袖手旁观，听任那个女的遭抢劫。
look over 查看，检查
Don't forget to look over your work at the end of the examination.别忘了考试结束前把所做的题检查一遍。
look through 从头看完，浏览
He looked through the applications and picked out the best.他翻阅了所有申请表格，从中挑出最佳人选。
look up 好转，改善;在词典里查询。
It is a good habit to look up new words in a dictionary.在词典里查生词是一个良好的习惯。
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