HSK 7-9
缸
gāng名
jar; vat; classifier for loads of laundry
院里水缸装满了雨水。
Yuàn lǐ shuǐ gāng zhuāng mǎn le yǔ shuǐ.
The water vat in the courtyard is filled with rainwater.
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Also free:
Appears across levels (7-9) in the HSK 3.0 word list.