out·post /ˈaʊtˌpost/
  前哨,前哨部隊,前哨地點
  Out·post n. Mil. (a) A post or station without the limits of a camp, or at a distance from the main body of an army, for observation of the enemy. (b) The troops placed at such a station.
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  outpost
       n 1: a station in a remote or sparsely populated location [syn: outstation]
       2: a settlement on the frontier of civilization [syn: frontier
          settlement]
       3: a military post stationed at a distance from the main body
          of troops