当船航行在海上时，船员们每天四餐，其他时间则每日三餐。

When the ship is at sea, they have four meals a day; otherwise, they have three meals a day.

youdao

我读过一本故事书。很多船，当它们航行在海上的时候就消失了。

I read a story book. Many boats, many boat, when they are sailing on the sea, (they) disappeared.

youdao

我读过一本故事书。很多船，当它们航行在海上的时候就消失了。

I read a story book. Many boats, many boat, when they are sailing on the sea, (they) disappeared.

youdao