A sentry is a soldier whose job is to stand and watch, usually outside a building, a gate, or a camp. The sentry is not there to fight in that moment; the sentry is there so that nobody slips in, and so that a warning can go up if something is wrong.

A sentry is a soldier whose job is to stand and watch哨兵是一種士兵，工作是站著看守， usually outside a building, a gate, or a camp通常是在建築物、大門或營區外面。The sentry is not there to fight in that moment哨兵在那個當下不是為了打仗； the sentry is there so that nobody slips in哨兵在那裡是為了不讓任何人偷偷溜進來， and so that a warning can go up if something is wrong也是為了在出狀況時能發出警報。

Armies have used sentries for a very long time, and you still meet the word in news about military places, and in books and films. In everyday talk many people just say “guard.” To “stand sentry” is to do that watching job.

Armies have used sentries for a very long time軍隊使用哨兵已經很久很久了， and you still meet the word in news about military places, and in books and films你仍然會在軍事新聞、書籍和電影裡遇到這個字。In everyday talk many people just say guard平常說話大家常常就說 guard； To stand sentry is to do that watching job「stand sentry」就是在做那份看守的工作。

Though actually, not every guard is a sentry: a sentry is the one posted at a post, often alone or in a small pair, staying awake and looking out.

Though actually不過其實， not every guard is a sentry不是每個 guard 都是 sentry： a sentry is the one posted at a post, often alone or in a small pair, staying awake and looking outsentry 是被派駐在崗位上的那種，常常是獨自一人或兩人一小組，保持清醒、注意周圍。