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合成石油
héchéngshíyóu
1. synthetic oil

Character Breakdown

合
hé
to combine, to join, to unite; to gather
HSK 4 6 丶
成
chéng
to accomplish; to become; to complete, to finish; to succeed
HSK 3 6 丶
石
shí
stone, rock, mineral
HSK 5 5 丶
油
yóu
oil, fat, grease, lard; oil paints
HSK 4 8 丶

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