1. But her voice was trembling.
    但是声音在颤抖。

2. He was trembling with fear.
    他怕得发抖。

3. Suddenly, there was a slight trembling sound from below, and the captain went down to see what had happened.
    突然，从船舱下部传来一声微颤音，船长走下船舱去查看究竟。