相关单词同義詞required, obligatory, required routine, 近義詞 obligatory, forced, required, mandatory反義詞optional, voluntary臨近詞compunction, compulsive, compulsory pay, compulsory fee, compulsory law, compulsory fees, compulsory vote, compulsory stop, compulsory book, compulsory loan, compulsory debt, compulsory work相似詞compromising, comptroller, compulsion, compulsive, compulsory purchase order, compunction, computational, computational linguistics, 返回 compulsory