On the sea 和in the seaColorful sailing boats are swimming on the sea还是Colorful sailing boats are swimming in the sea= =
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On the sea 和in the seaColorful sailing boats are swimming on the sea还是Colorful sailing boats are swimming in the sea= =
On the sea 和in the sea
Colorful sailing boats are swimming on the sea还是Colorful sailing boats are swimming in the sea= =
On the sea 和in the seaColorful sailing boats are swimming on the sea还是Colorful sailing boats are swimming in the sea= =
in the sea 在海里
例句与用法:
Sealed containers of nuclear waste have been dumped in the sea.
盛有核废料的密封容器被丢在海里.
Swimming in the sea is great fun.
在海里游泳很好玩.
on the sea 在海（面）上
例句与用法:
The sun glared on the sea.
太阳在海上发出令人目眩的光芒.
at sea 离开陆地(茫然)
例句与用法:
He felt completely at sea in his new school.
他在新学校中感到茫然不知所措.
The refugees were at sea for forty days before reaching land.
这些难民在海上漂泊了40天后,他们的船才靠岸.
本题选on
应该是Colorful sailing boats are swimming on the sea
on the sea是在海边，in the sea是在海里
on
boat 明显是在海面上的
用in的话，是在海里面，鱼在海里游就要用in。