Sightglass
监视孔; 观察孔; 窥镜
🗣️ 情景例句
Where is your birthplace?
你出生在哪里？
Speed is the soldier's asset.
兵贵神速。
The porter went to fetch one and arrive back with the station master,
搬运工跑回去取时刻表，同时请来了站长。