If an action or procedure is mandatory, people have to do it, because it is a rule or a law.
例句
...the mandatory retirement age of 65...65岁的法定退休年龄Attendance is mandatory.务必参加。
ADJ
(惩罚)强制性的,法定的
If a crime carries a mandatory punishment, that punishment is fixed by law for all cases, in contrast to crimes for which the judge or magistrate has to decide the punishment for each particular case.
例句
...the mandatory life sentence for murder.谋杀罪必然会面临的终身监禁...the four-year ban which is mandatory.为期四年的强制禁令
英汉词典释义
adj.
命令的;强制的;义务的
Is the appointment of worker-directors to be mandatory?工人董事的任命是不是强制性的?
英英词典释义
Noun
1. the recipient of a mandate
2. a territory surrendered by Turkey or Germany after World War I and put under the tutelage of some other European power until they ar able to stand by themselves
Adjective
1. required by rule;
"in most schools physical education are compulsory""attendance is mandatory""required reading"