There have been large-scale military manoeuvres on the frontier.

边境地区曾有过大规模的军事。

This happened in the center of operations.

这事发生在的过程中。

The fleet is maneuvring off the east coast.

舰正在东海外。

The fleet is -ring off the east coast.

舰东海进行。

The drilling troops mustered on the hill.

部在小山上集合起来了。

Military planes flew over the country in a warlike action.

军用飞机在进行军事时从该国上空飞过。