sight-hole

常见例句

• 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。
• He chiseled a hole in the door to fit a new lock.
  他在门上凿了个孔，以便装一把新锁。
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