mandatory◇强制性法律 mandatory law; 强制性规定 mandatory provision; 强制性规则 mandatory rule; 强制性条款 mandatory term; 强制性再教育 compulsory re-education; 强制性制裁 mandatory sanction非强制性的: optional强制性标准: comparable standard; compulsory standards; mandatory standard强制性操作: imperative operation强制性程序: mandatory procedure强制性痴笑: forced laughter; obsessive laughter下载手机词典可随时随地查词查翻译