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

參考例句：
  • Fortify a city
    筑工事以鞏固城防
  • chemical,biological and radiological protectiveinstallations in shelter
    工事防化設(shè)施
  • The Great Wall is difficult to slight.
    長城是難以拆毀的一道工事。
  • A narrow entrance into the outwork of a fortification.
    狹窄入口要塞的外圍工事的狹窄入口
  • The regiment secured its position while awaiting the enemy attack
    該團在等待放人進攻之時加強了陣地工事。
  • A minor fortification constructed beyond a main defensive position or fortification.
    簡易外圍工事在主要防御位置或防御工事之外構(gòu)筑的小防御工事
  • People have been mobilised to build defences and drain flooded land as heavy rains continue to fall.
    大雨還在繼續(xù)下，人們已經(jīng)被動員起來修筑防洪工事，為遭淹田地排水。
  • Raised earthworks inside the city walls could greatly reduce the effects of artillery bombardment
    城墻以內(nèi)突起的土木工事可以大大減少大炮轟擊的效果。
used是什么意思：
adj. 用過的，舊的；習(xí)慣于…的
  • It is used as a reflexive.
    它被作為反身代詞使用。
  • That was a balk to us.
    那對我們是個挫折。
  • They help us to be maximal encouraging to us.
    他們來幫助我們對我們是個極大的鼓舞。
protect是什么意思：
v. 保護，保衛(wèi)
  • A protective overlay, as for a mattress or furniture.
    護套保護性的飾布，如坐墊或家具。
  • a protective case for a knife or sword.
    刀或劍上的保護性外殼。
  • invoke the protection of...
    祈求…的庇護

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