词根：-sur-

【词根含义】：确信

【词根来源】：来源于拉丁语中由前缀se-(分离,没有)和名词cura(关心)组成的securus(无忧无虑的,没有危险的); securus直接进入英语产生了词汇secure,而经由古法语sur进入英语则产生了-sur-。

【同源单词】：assurance, assure, ensure, insurance, insurant

前缀：il-, in-, ir-, im-

【词根含义】：不,无,非;入,向内

【词根来源】：(il-用于l前;im-用于b, m, p前;ir-用于r前;in-用于其它情况)   来源于拉丁语in。

【同源单词】：illegal, illegality, illegitimate, illiterate, illogical

词根词缀：-ance, -ancy

【来源及含义】Latin: often through French, quality or state of; being; condition; act or fact of _______ ing; a suffix that forms nouns

【同源单词】aberrance, absorbance, absorptance, abundance, acceptance, accordance

词根词缀：cura-, cur-

【来源及含义】Latin: care, heal, cure; care for, give attention to, to take care of

【同源单词】accuracy, accurate, accurately, assurance, assure, assuredly