lend a hand . give a hand . help；give assistance 帮助

Please lend a hand with my luggage．请帮我拿一下行李。

Ask the boy to lend a hand with moving the piano．让这男孩帮忙搬一下这架钢琴。

Dick saw a woman with a flat tire and offered to give her a hand with it ．狄克见一妇人轮胎泄气，就自告奋勇帮助她补胎。

 lend itself to . give a chance for or be useful for；be possible or right for适合；适宜于

This subject lends itself admirably to dramatic treatment．这个题目极其适合写成剧本。

The building lends itself to conversion into a theatre．这座大楼很适合改成剧院。

lend oneself to . give help or approval to；encourage；assist 帮助；协助；赞助；鼓励

Don't lend yourself to such dishonest schemes．不要参与这种欺诈的勾当。

Alice wouldn't lend herself to the plot to hide the teacher's chalk．艾丽斯不赞成要把教师的粉笔藏起来的鬼主意。

 lend to . contribute 给予；使具有…作用

The support of the government lent importance to the study of the new economic theory．政府的支持对研究那项新的经济理论起了重要的作用。

The laboratory research will lend significance to the police analysis of criminal cases．实验室的研究工作对警察分析案例将起到重要的作用。

length by length . by making gradual progress 渐渐地进展

Length by length，a caterpillar got to the top of the tree．毛虫缓缓地爬到了树的顶端。

less than . not；little不；不太

We were busy and less than delighted to have company that day．那天我们很忙，不喜欢有客人来。

He was less than happy about going to the cinema that night．那天晚上，他不高兴去看电影。

The road was something less than smooth．那条路不太平坦。

 less than no time . very short time 很短时间

We can be ready to go in less than no time．我们马上就可以准备出发。

It took her less than no time to get dinner ready．她很快就把饭菜做好了。

 let off steam .  blow off steam . let or make steam escape 排气；放气

The worker let off some steam because the pressure was too high．那位工人排出一些水气，因为压力大高。

let off steam .  blow off steam . get rid of physical energy or strong feeling through activity；indulge in strong or violent language to relieve one's feeling 发泄精力或情绪；讲激烈而粗野的话以发泄感情；出气

When the rain stopped，the boys let off steam with a ball game．雨停后，孩子们赛球解闷。

When men let off steam，they tend to shout；women，on the other hand，express their feelings by weeping．男人发泄强烈感情时，倾向于大声喊叫；妇女则不然，用哭泣来发泄感情。

Don't take any notice of what he says；he's just letting off steam．不要理睬他所说的话，他在出气罢了。

Bill had to take his foreman's rough criticisms all day and he would blow off steam at home by scolding the children．比尔整天挨领班的训责，回家后就拿孩子出气。

let alone . allow somebody to do something unaided；not interfere with 别管；别干涉

When joe gets mad，just let him alone．乔发怒时不要去管他。

Please let my things alone．请不要干涉我的事情。

let alone . not to mention；to say nothing of 更不用说

I can't afford a bicycle，let alone a car．我连一部自行车也买不起，更不用说买小轿车了。

He doesn't have enough money for food，let alone amusements．他连吃饭都不够，更不用说娱乐了。

I wouldn't speak to him，let alone trust him and lend him some money．我理都不愿理他，更谈不上信任他，把钱借给他了。

let bygones be bygones . let the past be forgotten 既往不咎

After a long angry quarrel，the two boys agreed to let bygones be bygones and made friends again．两个孩子进行了长时间的激烈争吵，后来同意言归于好，既往不咎。

let down . descend；lower 放下

Please let down the blinds．请把百叶窗放下。

let down . disappoint；betray 使…失望

The team felt that they had let the coach down．队员们觉得他们让教练失望了。

We've been let down so many times by the importers，who always seem to be late delivering the goods．进口商们已多次令我们失望，他们似乎总是要推迟交货。

He won't let you down；he's very reliable．他不会让你失望的，他很靠得住。

let down . slow up；slacken 慢下来；松懈

The horse let down near the end of the race and lost．那匹马在近终点时慢了下来，所以输了。

Don't let down even if the going is good．即使在顺利的情况下也不要松劲。

We must not let down our vigilance against the enemy．我们决不可放松对敌人的警惕性。

let down . lengthen；make（clothes）longer延长；把（衣服）放长

She let the dress down，several centimetres．她把这件衣服放长了几厘米。

let down . loosen and let fall 披散

She let her hair down．她披散着头发。

let down . deflate 放气

A naughty boy has let down the back tyre of my bike．一个顽皮的男孩把我自行车后胎的气给放了。