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字[ zì ] 母[ mǔ ]
Vocabulary
字母
[ zì mǔ ]
Intermediate Level（Band 4）
How to Read
letters [of an alphabet]
1. 字母x代表未知数。
[ zì mǔ x dài biǎo wèi zhī shǔ 。 ]
The letter "x" stands for an unknown number.