[ˈmændət(ə)ri]

adj.强制性的，强迫的

Mandatory是一个高频词，比如强制性计划是mandatory plan，强制性规则是mandatory rule；必须遵循的要求是mandatory requirement；法定标准是mandatory standard。

我们来看2个例句：

Mandatory seat-belt laws and their enforcement have been shown to be very effective at increasing seat-belt wearing rates.

已经证明，强制性安全带法律及其执法情况对于提高安全带使用率十分有效。

If you are ill, please do not come, as even minor infections can spread rapidly through the children. Frequent handwashing is mandatory.

如果你生病了，请不要来，即使很小的感染也可以很快的感染孩子。经常洗手是强制性的。