by my fay

• 我保证

by my fay的用法和样例：

例句

1. None will be hit, I pledge my honour.
   我保证一个人也不会受到伤害。
2. I will ensure that the car arrives by six o'clock.
   我保证汽车六点钟以前到。
3. Oil is cracked by heating under pressure.
   石油在一定压力下加热分解。
4. I think my letter must have miscarried.
   我想我的信一定是误投了。

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