哨
shào
a whistle
sentry
老师吹哨，让大家停下来。
lǎo shī chuī shào ，ràng dà jiā tíng xià lái 。
The teacher blew the whistle to make everyone stop.
士兵在门口站哨，不让人随便进去。
shì bīng zài mén kǒu zhàn shào ，bù ràng rén suí biàn jìn qù 。
The soldier stood sentry at the entrance, not letting people go in freely.