例句：
We promise to deliver within 48 hours.
我们承诺在48小时内送到。
Promise me you will not waste your time.
向我承诺你不会浪费你的.时间。
I promise I am in this for the long haul.
我保证我会坚持到底。
If you make a promise, you should keep it.
如果你许下一个诺言，你就应该遵守它。
He reneged on a promise to leave his wife.
他背弃了诺言，离开了他的妻子。