鸭子在河面上游来游去。

Ducks were swimming around on the river.

《牛津词典》

由于水污染，我们可以在河面上看到数以百计的死鱼。

Hundreds of dead fish can be seen on the surface of the water because of water pollution.

youdao

目前为止，他只在河面上飞，基本不会引起任何注意。

For now, he limits his flights of fancy to the airspace over the river, where he is unlikely to draw much attention.

youdao

And that was the case in our village because there wasn't a bridge across the river, and there was a little boat would take people across this awesome, swirling,dangerous river.

那就是我们村的情况,在河面上没有桥,那儿有一条小船可以载人通过那条,水波滔天的危险的河

耶鲁公开课 - 1871年后的法国课程节选