The deer fled to a covert.

鹿逃入丛林中。

Religion is often made the covert of crime.

宗教常成为罪恶护庇所。

We should learn to fight with enemy in an overt and covert way.

我们应学会同敌人做公开和隐蔽斗争。

Students protested covert actions undertaken by the CIA.

学生们抗议中央情报局隐蔽举动。

The army carried out covert surveillance of the building for several months.

军队对这座建筑物进行了数月监视。

Also, in all of these photos, you cannot see "hanging" alula or primary coverts often shown by Rook.

同时，所有照片都看不到『悬挂起来』小翼羽或大覆羽，通常秃鼻鸦会有这个特徵。