HSK 6
正规
zhèngguī形
regular; according to standards
他通过正规渠道购买门票。
Tā tōng guò zhèng guī qú dào gòu mǎi mén piào.
He bought the ticket through an official channel.
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Other HSK words sharing a character
Also free:
New in the HSK 3.0 word list at level 6.