bằng sáng chế
patent
Tones 3 syllables — bằng: huyền (low falling) · sáng: sắc (high rising) · chế: sắc (high rising) ?
patent
Tones 3 syllables — bằng: huyền (low falling) · sáng: sắc (high rising) · chế: sắc (high rising) ?
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