sentry

详细解释:n. 哨兵, 看守
vt. 设岗哨
vi. 站岗, 放哨
相关词组:
be on sentry
come off sentry
stand sentry

词型变化：

名词复数:sentries

英语解释：

名词 sentry:

a person employed to watch for something to happen同义词：lookout, lookout man, sentinel, watch, spotter, scout, picket