HSK 2
快
kuài形副
rapid; quick; speed; rate
快一点儿，我们要上课了。
Kuài yìdiǎnr, wǒmen yào shàngkè le.
Hurry up; class is about to start.
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Hold the button, say it, then let go.
Other HSK words sharing a character
Also free:
New in the HSK 3.0 word list at level 2.