grasp at straws

• 捞救命稻草

grasp at straws的用法和样例：

例句

1. He acted like a drowning man trying to catch at a straw.
   他那样做好像一个快要淹死的人拼命想捞救命稻草一样。
2. You're grasping at straws if you think you can pass that exam by starting to study the night before!
   要是你认为在考试前一天的晚上开始念书就能通过考试的话，那你就是想捞救命稻草。