sight-hole

基本解释

• n.觀察孔光學瞄準器

同根派生

英汉例句

• 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。