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未[ wèi ] 知[ zhī ] 数[ shǔ ]
Vocabulary
未知数
[ wèi zhī shù ]
Advanced Level(Band 7-9)
How to Read
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.