pledge和promise有什么区别

　　pledge例句分享

　　The government pledged their support for the plan. （用作动词）

　　政府保证支持这项计划。

　　The pledge has long since run out. （用作名词）

　　抵押早已期满。

　　They were all pledged to secrecy. （用作动词）

　　他们都宣誓保密。