“shake”是“摇摆”，“leaf”是“叶子”，“shake like a leaf”并非“像树叶一样摇摆”，而是指一个人“因紧张或害怕而颤抖”，或者因为天气寒冷，“冻得直哆嗦”。

【例句】
My brother is so strong and scary looking that he leaves people shaking like a leaf when he threatens them.
我的哥哥很强壮，长得很吓人，他威胁人的时候，让人们害怕得发抖。

I was shaking like a leaf when I went up to deliver my speech in front of all those people.
当我上去在那些人面前发表演讲的时候，我紧张得发抖。