1. A reply to this letter is mandatory.
    这封信非答覆不可。

1. 强制的：根据劳工部新设计的劳工证系统,美国雇主将被要求在提交劳工证申请之前先进行招聘程序,雇主将被要求从事强制的(Mandatory)和可替代的 (Alternative)劳工招聘程序.

2. 强制性的：两者的执行在美国是分离且不同的,检验(Inspection)是强制性的(Mandatory)规定,是为确保生产及行销肉品安全卫生;分级(Grading),反之则是自愿性的(Voluntary)作业,为区分鲜肉的食用品质及产出.

3. mandatory的反义词

3. 必须的：是系统提供的,可由用户在外部看到的服务,这些服务满足了用户的需求.UFIDA U9在进行领域工程时,将特征三种主要的类型,即:必须的(Mandatory),可选的(Optional)和多选一的(Alternative).其中:基于对这一软件产业发展模式的引领和推动,

1. 强制性的; 法定的;义务的
    If an action or procedure is mandatory, people have to do it, because it is a rule or a law.

公共查询·英语单词大全

    e.g. ...the mandatory retirement age of 65...
           65岁的法定退休年龄
    e.g. Attendance is mandatory.
           务必参加。

2. (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.

    e.g. ...the mandatory life sentence for murder.
           谋杀罪必然会面临的终身监禁
    e.g. ...the four-year ban which is mandatory.
           为期四年的强制禁令

1. a territory surrendered by Turkey or Germany after World War I and put under the tutelage of some other European power until they are able to stand by themselves

    Synonym: mandate

2. the recipient of a mandate

    Synonym: mandatary

1. required by rule

    e.g. in most schools physical education is compulsory
           attendance is mandatory
           required reading

    Synonym: compulsoryrequired