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
Yes, most of them are, except for the plastic parts.
对，除了塑料制品其他都是。
He is on the phone.
他正在通话。
I think foreign languages are more interesting than science.
我想外语比自然科学更有趣。