HSK 7-9
摩擦
mócā动名
friction; rubbing; chafing; fig. disharmony
长期摩擦使零件表面发热。
Chángqī mócā shǐ língjiàn biǎomiàn fārè.
Prolonged friction heats the surface of the part.
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Appears across levels (7-9) in the HSK 3.0 word list.