fù​yīn

complex tone

复音 複音 fù​yīn
complex tone
a sound composed of two or more pure tones of different frequencies, such as those produced by musical instruments
reply
(literary) a reply; a message sent in response
diphthong
a sound formed by the combination of two vowels in a single syllable, in which the sound begins as one vowel and moves toward another
sound sequence
a sequence of sounds in speech or music

Frequency

Movie subtitles
0.030 per million appears in 0% of films
Written text
0.053 per million

Sources