大副

例句：

1. 1. He is the first mate on our ship.
   他是我们船上的大副。
2. 2.The captain made a decision that affected everyone's lives.
   船长做出了一个影响每个人的决定。
3. 3. The first mate was responsible for ensuring the safety of all passengers and crew.
   大副负责确保所有乘客和船员的安全。