HSK 6
快捷
kuàijié形
quick; fast; nimble; agile
网上付款更加方便快捷。
Wǎng shàng fù kuǎn gèng jiā fāng biàn kuài jié.
Paying online is more convenient and faster.
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Other HSK words sharing a character
Also free:
New in the HSK 3.0 word list at level 6.