chất xúc tác
catalyst
Tones 3 syllables — chất: sắc (high rising) · xúc: sắc (high rising) · tác: sắc (high rising) ?
catalyst
Tones 3 syllables — chất: sắc (high rising) · xúc: sắc (high rising) · tác: sắc (high rising) ?
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