sen·try /ˈsɛntri/
 衛兵,看守,哨所(vt.)設崗哨(vi.)站崗,放哨
 Sen·try n.; pl. Sentires
 1. Mil. A soldier placed on guard; a sentinel.
 2. Guard; watch, as by a sentinel.
 Here toils, and death, and death's half-brother, sleep,
 Forms terrible to view, their sentry keep.   --Dryden.
 Sentry box, a small house or box to cover a sentinel at his post, and shelter him from the weather.
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 sentry
      n : a person employed to watch for something to happen [syn: lookout,
           lookout man, sentinel, watch, spotter, scout,
          picket]