HSK 7-9
长足
chángzú形
remarkable (progress, improvement, expansion etc)
产品质量有了长足进步。
Chǎn pǐn zhì liàng yǒu le cháng zú jìn bù.
The product's quality has improved remarkably.
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Other HSK words sharing a character
Also free:
Appears across levels (7-9) in the HSK 3.0 word list.