单词复习2

obligate: [ 'ɔbligeit ] v. 使负义务,强制,预留
同义词：oblige
例句与用法:
1.    We were obligated to attend the opening ceremony.
    我们有必要参加开幕式.
2.    He felt obligated to help.
    他觉得有责任予以帮助.

  equivalent: [ i'kwivələnt ]
a. 等价的,相等的
n. 相等物

1.He changed his pounds for the equivalent amount in dollars.

他把英镑兑换成等值的美元。

2. Changing his job like that is equivalent to giving him the sack

那样调换他的工作等于是解雇了他。