For example, frigatebirds spend days flying over the ocean looking for food, so when do they sleep?

例如，军舰鸟在海洋上空飞行数日寻找食物，那么它们什么时候睡觉呢？

The greater frigatebird will help feed and take care of its chick for almost two years after it hatches.

比较大的军舰鸟在宝宝孵出来以后，要喂养、照顾幼崽接近两年时间。

The frigatebird, which is of no larger dimensions, pursues him, strikes him on the neck with his beak, and constrains him to yield up his prey.

军舰鸟追赶着体型并不大的小鸟，用自己的鸟嘴去攻击它的颈项，迫使它放弃自己的食物。