The ducks are swimming in the river.为什么用介词in,而不用on

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The ducks are swimming in the river.为什么用介词in,而不用on
The ducks are swimming in the river.为什么用介词in,而不用on

The ducks are swimming in the river.为什么用介词in,而不用on
你要知道river这个词的意思是两个相对的岸夹的部分,所以当然是用in.
如果说在水面上,就用on.
解释一下river一词的来历.在拉丁文里,riv是相对的意思,而river就是相对的两个东西,也就是指两个河岸相夹的中间的部分.这个部分包括整个水体,所以是in the river.其实汉语里也是说“在河里游泳”,从没听说过“在河上游泳”.

这是英文习惯，没有为什么

on 表示在某处的表面。
例如：on the wall. on the table 等等。
in 表示在某处内。
The ducks are swimming in the river。此句中的The ducks要swim，一定是在水中游，所以用in.
另外，river 有一定的空间，一定都用in搭配。中文意思是河里。

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