防御工程 meaning in Chinese

defence

The guards were searching him for the map of defence works
卫兵在他身上搜查防御工程图。
They are repairing the defense works
他们正在修防御工程。
It is the most magnificent ancient military defence work and one of the most remarkable ancient buildings in the world
它不仅是古代最雄伟的军事防御工程，也是世界上最非凡最伟大的古老建筑之一。
The jiayuguan pass tower , strategically located between the qilian mountain and mazong mountain , guards the east - west passageway at the western end of the great wall and is the best preserved pass . surrounded by three inner and outer walls and several lines of defense , jiayuguan was a vital military stronghold of defense
嘉峪关城楼，向南至终年积雪的祁连山下讨赖河畔，明长城依山势起伏隐现，向北到黑山悬崖，长城蜿蜒绵亘，嘉峪关城楼位于祁连山与马鬃山这间狭长咽喉地带的最窄处，镇守东西通道，是万里长城西端险要关隘，也是长城沿线保存得最完整的一座雄关，嘉峪关城由三重城郭多道防线，形成重城并守之势，构成一个壁垒森严的军事防御工程。