学员们外出进行军事演习。

The cadets are out on military ___exercises.

我并不反对军事演习，但在这个每个人都应促进环境保护的世界里，这种嘈杂的活动是不能容忍的，包括军队。

I am not opposed to military ___exercises, but such a noisy activity cannot be tolerated in a world in which environmental protection should be promoted by everybody, including the army.

这次联合军事演习旨在测试部队对潜在冲突的准备情况。

The joint military ___exercise aimed to test the troops' readiness for potential conflicts.