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次音速 /cìyīnsù/ meaning in English

ChineseEnglish
次音速 /cìyīnsù/ adjective

subsonic((of a speed) less than the speed of sound)
adjective
[UK: ˌsʌb.ˈsɒ.nɪk] [US: ˌsʌb.ˈsɒ.nɪk]