词根词缀：nul-, null-, nulli-

【来源及含义】Latin: not one, not any, none, nothing

【同源单词】Aliquis in omnibus, annul, annullable, annulment, Fortuna multis dat nimis, Fortuna obesse nulli contenta est semel

词根词缀：oper-, opus

【来源及含义】Latin: work

【相关词根词缀】 Cross references related to "work, toil" word families: argo-; ergasio-; ergo-; labor-; pono-; urg-.

【同源单词】co-operate, co-operation, co-operative, co-operativeness, ignioperation, inoperable

词根词缀：optim-

【来源及含义】Latin: best, exceptionally good

【同源单词】Amicus optima vitae possessio, Magnus opus, Nil nisi optimum, optimal, optimal allocation, optimal control

词根词缀：second-, secund-, secundi-

【来源及含义】Latin: second, following

【同源单词】deuteripara, Magnus opus, nulli secundus, second, secondarily, secondary