clutch (或 grasp, catch) at straws

be in such a desperate situation as to resort to even the most unlikely means of salvation

捞救命稻草，作最后的绝望挣扎

draw the short straw

be the unluckiest of a group of people, especially in being chosen to perform an unpleasant task

抽到下下签（尤指被选中去执行倒霉任务）

the last (或 final) straw

a further difficulty or annoyance, typically minor in itself but coming on top of a whole series of difficulties, that makes a situation unbearable

最终使人无法忍受的一击；终于导致失败的因素

his affair was the last straw.

他的风流事是最终导致失败的因素。

a straw in the wind

a slight hint of future developments

（预示将来发展的）迹象，预兆，苗头

straw in the wind

A slight hint of something to come.

某事要来的微弱暗示