boat和ship分别是in the sea 还是on the sea at
问题描述：
boat和ship分别是in the sea 还是on the sea at
答
There is a boat in the sea.小船在海里.（boat小,处在水中,用in.）
Look!A big ship is on the sea.瞧,海上有首大船.(ship大,处在水面上,用on.)