Sentry duty
na. 步哨勤务\\n
🧩 词语组成解析
sentry
['sɛntri]
n. 哨兵;警卫;
🗣️ 情景例句
There's only one problem.
只有一个问题。
In every beginning think of the end.
思前顾后。
The examination put a lot of stress on him.
那次考试给了他很大的压力。