英文里，如下得詞都帶有“保證”得意思：
Assuarance, commitment, guarantee, promise, and warranty
雖然如此，但內(nèi)涵并不完全相同。
Assuarance 有“保證；保險得意思”，但這個“保證”并不具備法律效力，跟promise差不多，都是可能會違背得(Promises can be broken)，例如: I promise to visit you. I promise to pay you back. His assurance in his superiority did not make him popular.
相比之下，commitment就要鄭重其事得多，（Commitment is suitable for those who want to make a declaration but with all the elements of dedication. A promise may or may not hold true in the future, but the commitments are more likely to be met.）也就是說，commitment需要有行動來支撐，例如：We made a commitment to keep working together.
guarantee 是一個法律用語，是一項非常正式得承諾(is to assure that something will get done right while promise is to commit to something or action) 例如：They are demanding certain gurantees before they sign the treaty.
而waranty 可以理解成“保修（期）”，這是一種gurantee，但是附帶有條件，比如保修多久、哪些屬于保修范圍等等。
大家明白了么？
