0 New HSK word(s):
0 Old HSK word(s):
氧化铜 [yang3 hua4 tong2] Kupferoxid, Kupfer(II)-oxid (S, Chem)
氧化亚铜 [yang3 hua4 ya4 tong2] Kupferoxid, Kupfer(I)-oxid (S, Chem)