0 Old HSK word(s):
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Hsk Characters:
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Formaldehyd (S, Chem) [jia3 quan2] 甲醛
Harnstofformaldehyd (S, Chem) [niao4 quan2 shu4 zhi1] 尿醛树脂
Polyformaldehyd (S, Chem) [ju4 jia3 quan2] 聚甲醛