阴平 (陰平) yīnpíng

yīnpíng noun high and level tone; first tone
Domain: Linguistics 语言学 , Subdomain: Phonetics , Concept: Tone 声调
Notes: The first tone in modern standard Chinese pronunciation, which is constant in intensity and is longer in duration than the second and fourth tones. It is [55] in Chao's tonal scale (Norman 1988, pp. 145-148).

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阴平声