(as) sure as a gun

• 必然；一定

(as) sure as a gun的用法和样例：

例句

1. Poor health is a necessary result of over-exertion.
   体弱是过度劳累的必然结果。
2. It is no fun betting on a sure thing.
   对必然要发生的事打赌是毫无意义的。
3. One must sight carefully before firing his gun.
   在放枪前一定要仔细地瞄准。
4. It looks as if we are in for a big storm.
   看来我们一定会碰上一场暴风雨。