com·pul·so·ry /kəmˈpʌlsri, ˈpʌlsə-/
(a.)強迫的,強制性的,義務的
Com·pul·so·ry a.
1. Having the power of compulsion; constraining.
2. Obligatory; enjoined by authority; necessary; due to compulsion.
This contribution threatening to fall infinitely short of their hopes, they soon made it compulsory. --Burke.
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compulsory
adj : required by rule; "in most schools physical education are
compulsory"; "attendance is mandatory"; "required
reading" [syn: mandatory, required]