习惯用语be on sentry1.站岗, 看守be on sentry-go1.放步哨carry off a sentry1.活捉或干掉哨兵come off sentry1.下岗; 交班go on sentry1.上岗, 接班keep sentry1.警卫, 站岗post on sentry1.放步哨relieve a sentry1.换哨[防]stand sentry1.站岗, 看守