Question

一一一一[yī yī]1.■each; separately; each one; one by one; one after another:一一告别say good-bye to everyone;一一核对事实check facts one by one;一一就座seat themselves one after another;一一申辩justify oneself point by point

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常用词组1.■一一对应 {数} linearity; monogamy; one-to-one correspondence; one-to-one transformation;2.■一一关系 {逻} one-one relation;3.■一一函项 {逻} biunique function;4.■一一映射 {数} one-one mapping; one-to-one mapping