Obviously sleeping safely at sea can pose problems, but the Marine mammal system has addressed them.

显然安全地在海里睡觉会产生一些问题，但海洋动物的系统已解决了这些问题。

youdao

Obviously sleeping safely at sea can pose problems, but the Marine mammal system has addressed them.

显然安全地在海里睡觉会产生一些问题，但海洋动物的系统已解决了这些问题。

youdao