1.let alone 不打扰,不惊动，更别提
例句：Clinically depressed people often can't get out of bed, let alone command an army.
临床的消沉症患者经常不能离开床并且可以单独指挥一支军队。
2.let go 放，释放，松手，发射，放弃
例句：How wonderful to be able to let go and smile again, long before you are dying.
能让你走和再次微笑是多么美妙的事情啊，这是你临死之前渴望的。
3.let off 排放(液体等），放过，宽恕
例句：It would let off the hook thousands of people who have used UBS to avoid billions in taxes.
这样将会让成千上万的使用过瑞银的人有机会逃避数十亿的税收。
4.let up 停止，暂停，放松,减弱,减轻，变得更宽大
例句：he Chinese, however, did not let up their barrage of public criticisms.
然而中国并未因此停止在公共场合的指责。
5.let out 放走，释放，泄露，使知道
例句：He was let out of prison.
他被释放出狱。
6.let through 准许…通过
例句：A number of mistakes in the proofs were let through.
在这些证据中有许多错误之处都放过了。