obligatory

英[əb'ligətəri]美[əb'ligətəri]

a.
义不容辞的，义务的，必须的

反：	[a.] optional

Attendance is oBligatory. Mathematics is an oBligatory course.
出席是必须的，数学是一门必修课。收藏
A Bill oBligatory
债务的帐单收藏
When an end is lawful and obligatory, the indispensable means to it are also lawful and obligatory--Abraham Lincoln, American statesman
如果一个目的是正当而必须做的,则达到这个目的的必要手段也是正当而必须采取的。--美国政治家林肯收藏
When an end is lawful and obligatory, the indispensable means to it are also lawful and obligatory. ——Abraham Lincoln
如果一个目的是正当而必须做的，则达到这个目的之必要手段也是正当而必须采取的。——林肯收藏
Attendance at school is obligatory.
上学是强制性的.收藏

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morally or legally constraining or binding
- attendance is obligatory
- an obligatory contribution
[反] optional
required by obligation or compulsion or convention
- he made all the obligatory apologies

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