required

词形变化:

形容词: requirable | 名词: requirer | 动词过去式: required | 动词过去分词: required | 动词现在分词: requiring | 动词第三人称单数: requires |

同义词:

compulsory | essential | necessary | vital | forced | forcible | indispensable | mandatory | requisite | obligatory | prerequisite | needful | needed |

反义词:

elective |



词义辨析:

同义参见:

vital

necessary

compulsory

indispensable

forced

forcible

essential

反义:

a.(学科)必修的

elective

optional