on the lake与by the lake有何不同?

on the lake与by the lake有何不同? in the lake 与 on the lake 什么差别? in the lake和on the lake Down By The Lake 歌词 by the lake的意思 有by the lake这短语吗?by the river boat on the Kunming Lake in the sea 和on the lake by the lake的意思是什么? There are many boats on the lake Are they (skate)on the lake? There are many boats on the lake .