sight-hole

常见例句

• Causes and prevention of boiler sight hole leakage
  鍋爐檢查孔泄漏的原因及預防
• His strength in a crisis is an ace in the hole.
  臨危不懼是他的看家本領。
• The oil tanker soon got out of sight.
  油船不久就看不見了。
• She was sick at the sight of the blood.
  她一見到血就感到惡心。
• The sentry was ordered to shoot on sight.
  哨兵奉命一發現目標就射擊。
• He chiseled a hole in the door to fit a new lock.
  他在門上鑿了個孔，以便裝一把新鎖。
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