sight-hole
基本解释
- n.观察孔光学瞄准器
英汉例句
- Causes and prevention of boiler sight hole leakage
锅炉检查孔泄漏的原因及预防 - His strength in a crisis is an ace in the hole.
临危不惧是他的看家本领。 - The oil tanker soon got out of sight.
油船不久就看不见了。 - She was sick at the sight of the blood.
她一见到血就感到恶心。 - The sentry was ordered to shoot on sight.
哨兵奉命一发现目标就射击。