compulsory

/kəmˈpəlsəri/

required by rule

中文释义：强制性的；义务的

In many countries, education is compulsory for children between the ages of 6 and 16.

在许多国家，6至16岁的儿童接受义务教育。

The new law makes it compulsory for all drivers to wear seat belts.

新法律强制所有驾驶员系安全带。