But as well as looking out for enemy activity,他们在探查敌军的动向的同时

as well as:既 ... 又

He grows flowers as well as vegetables.

他既种菜也种花。

It's so thin that it could melt away almost entirely in the summertime,冰面实在太薄到了盛夏

时节很可能会全部融化

melt away:(使)融化, (使)消散

The crowd melted away when the storm broke.

暴风雨一来，人群就散了。

All his support melt away when he really needed it.

在他真正需要支持时，却得不到一丝半点。

Whether or not that's a good or bad thing, of course,depends on your point of view.当然这究竟是好是坏每个人的观点不同

depend on:取决于

It all depend on whether she like the boss or not.

一切都取决于她喜欢还是不喜欢这个老板。

A lot will depend on how she responds to the challenge.

在很大程度上将取决於她对这一难题的反应。