A rule of correspondence between two sets where each element in the first set is uniquely assigned to an element in the second set.
两个集合之间的一种对应规则，其中第一个集合中的每个元素都唯一地对应于第二个集合中的一个元素。
| Expression | 函数两组元素一一对应的规则，第一组中的每个元素在第二组中只有唯一的对应量 |
|---|---|
| Meaning | A rule of correspondence between two sets such that there is a unique element in the second set assigned to each element in the first set. |
| Reading | hánshù liǎng zǔ yuánsù yīyīduìyìng de guīzé dìyī zǔ zhòngdì měi gè yuánsù zài dì'èr zǔ zhōng zhǐyǒu wéiyī de duìyìng liáng |
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