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