不要承诺做不到的事，不过一旦承诺，就要守信。
Undertake not what you cannot perform but be careful to keep your promise.
一旦你做出了承诺，就不能反悔了。
但你一旦做出那个承诺，你的生活是会有一些细微变化的。
But once you make that commitment, it does alters your life in little ways.
喜欢是轻松而淡淡的心态，爱一旦说出了口，就变成了一种誓言，一种承诺。
Like is relaxed and light mentality, love once spoke mouth, became a vow, a promise.
一旦得到承诺，他一定会得到一两遥控汽车作为生日礼物。
Once promised, he will surely be given a remote-controlled car as a birthday present.
一旦一个大国对一件事作出了承诺，它就必须取得成功。
一旦你做出了承诺，你就应该把它。
一旦你承诺了，你就必须遵守这个诺言！
最关键的区别是：一旦你结婚后，你对承诺的感受的改变。
The critical difference is how your perception of commitment changes once you are married.
一份承诺一旦被投邮便产生效力。
一旦你给了他人一个承诺，不管发生什么你都将去实现你的诺言。
Once you give somebody a promise, you must carry it out no matter what will happen.
一旦你给了他人一个承诺，不管发生什么你都将去实现你的诺言。
Once you give somebody a promise, you must carry it out no matter what will happen.
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