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极音速 /jíyīnsù/ meaning in English

ChineseEnglish
极音速 /jíyīnsù/ adjective

hypersonic(five times the speed of sound)
adjective
[UK: ˌhaɪ.pərˈ.sɑː.nɪk] [US: ˌhaɪ.pər.ˈsɑː.nɪk]