离开了主河道，他们进入了一个乍一看像是一个内陆湖的地方。

Leaving the main stream, they now passed into what seemed at first sight like a little land-locked lake.

同时对松花江达连河断面主河道上冰层中硝基苯含量进行了分层检测。

For understanding nitrobenzene distribution in water under natural ice in Songhua river, nitrobenzene contents of different ice layers of main riverway were examined at Dalianghe in Songhua river.

在这张图片的顶部，河中的一个弯曲几乎已经从主河道中分离出去，成为一个牛轭湖了。

Near the top of this image, a bend in the river has almost separated from the main channel to become an oxbow lake.