When I watch scary movies, I shake like a leaf.

每次看恐怖电影时，我都吓得浑身发抖。

Leaves quiver in the cold winter wind. When a person is frightened or very cold or very nervous, he may shake like a leaf.

叶子在寒风中会颤抖。当一个人很害怕、很冷、或者很紧张的时候，他就会颤抖得想一片树叶。