unheard-of英 [ʌnˈhɜ:d ɒv] 美 [ʌnˈhɜ:rd ʌv]
unheard-of 英英释义
unheard-of的解释
adj
1. previously unknown
e.g. a first novel by an unheard of writer
developments on an unheard-of scale
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