工事的英文：
stuctures used to protect military troops
fortifications

参考例句：
  • Fortify a city
    筑工事以巩固城防
  • chemical,biological and radiological protectiveinstallations in shelter
    工事防化设施
  • The Great Wall is difficult to slight.
    长城是难以拆毁的一道工事。
  • A narrow entrance into the outwork of a fortification.
    狭窄入口要塞的外围工事的狭窄入口
  • The regiment secured its position while awaiting the enemy attack
    该团在等待放人进攻之时加强了阵地工事。
  • A minor fortification constructed beyond a main defensive position or fortification.
    简易外围工事在主要防御位置或防御工事之外构筑的小防御工事
  • People have been mobilised to build defences and drain flooded land as heavy rains continue to fall.
    大雨还在继续下，人们已经被动员起来修筑防洪工事，为遭淹田地排水。
  • Raised earthworks inside the city walls could greatly reduce the effects of artillery bombardment
    城墙以内突起的土木工事可以大大减少大炮轰击的效果。
used是什么意思：
adj. 用过的，旧的；习惯于…的
  • It is used as a reflexive.
    它被作为反身代词使用。
  • That was a balk to us.
    那对我们是个挫折。
  • They help us to be maximal encouraging to us.
    他们来帮助我们对我们是个极大的鼓舞。
protect是什么意思：
v. 保护，保卫
  • A protective overlay, as for a mattress or furniture.
    护套保护性的饰布，如坐垫或家具。
  • a protective case for a knife or sword.
    刀或剑上的保护性外壳。
  • invoke the protection of...
    祈求…的庇护

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