严肃点儿! 嚴肅點兒! 嚴肅點兒!

Be a bit more serious!

Simplified
严肃点儿!
Traditional (Taiwan)
嚴肅點兒!
Pinyin
Yánsù diǎnr!
Bopomofo
ㄧㄢˊ ㄙㄨˋ ㄉㄧㄢˇㄦ!

Written with HSK 5 vocabulary, at CEFR level B2.

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