Sightglass
监视孔; 观察孔; 窥镜
🗣️ 情景例句
My boss thinks I'm a machine.
我的老板把我当机器使唤。
We've only sold our product at trade fairs, not in an on-going sales campaign.
我们的产品只在商展时展售，而没有办促销活动。
It is no use offering the manual labourer, tired out with a hard week's sweat and effort,
对于流汗出力干了一周苦活的体力劳动者来说，是不合适的；