Sàmóyēquǎn yǐ yǒngyuǎn wēixiào de biǎoqíng wénmíng.
The Samoyed is famous for its perpetually smiling expression.
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萨摩耶 sàmóyē = phonetic loan for 'Samoyed', the indigenous people of Siberia who originally bred them. Breed nickname in Chinese internet slang: 微笑天使 (smile angel).