哨兵查问在门口的陌生人。
The sentry challenged the stranger at the gates.

哨兵们都已各就各位。
The sentries are all at their posts.

向大门走去的人受到了哨兵的查问。
People approaching the gate were challenged by the sentry.

他吹口哨通知朋友继续隐蔽。
He whistled to his friend to keep hidden.

裁判哨子一响，比赛开始了。

他的口哨声使她心烦。
His whistling grated on her nerves.

人人都得站岗放哨。
No one was excluded from sentry duty.

农夫一边挤奶一边吹口哨。
The farmer whistled as he milked.