HSK 7-9
平稳
píngwěn形
smooth; steady
列车启动以后运行十分平稳。
Lièchē qǐdòng yǐhòu yùnxíng shífēn píngwěn.
The train ran very smoothly after starting.
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Hold the button, say it, then let go.
Other HSK words sharing a character
Also free:
Appears across levels (7-9) in the HSK 3.0 word list.