field·work /ˈfi(ə)lˌdwɚ/
 野戰工事,野外工作


 Field·work n. Mil. Any temporary fortification thrown up by an army in the field; -- commonly in the plural.
    All works which do not come under the head of permanent fortification are called fieldworks.   --Wilhelm.

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 fieldwork
      n : a temporary fortification built by troops in the field