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血清 [xue4 qing1]
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serum ☊
Blutserum (S, Med)
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血清 [xue4 qing1] ☊ 
serum ☊ 
Blutserum (S, Med) ☊ 血清 [xue4 qing1] ☊ serum ☊ Blutserum (S, Med) ☊