HSK 7-9
底子
dǐzi名
base; foundation; bottom
多年练习让她打下绘画底子。
Duō nián liàn xí ràng tā dǎ xià huì huà dǐ zi.
Years of practice gave her a foundation in painting.
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Appears across levels (7-9) in the HSK 3.0 word list.