HSK 7-9
秤
chèng名
steelyard balance; Roman balance
市场里的秤必须定期检查。
Shì chǎng lǐ de chèng bì xū dìng qī jiǎn chá.
The scales in the market must be inspected regularly.
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Hold the button, say it, then let go.
Also free:
Appears across levels (7-9) in the HSK 3.0 word list.