| 词汇 | unheard-of |
| 释义 | unˈheard-ofadj not known; never having happened before 不为人知的；前所未有的 un·heard-of /ʌn`hɜd ɑv; ʌnˈhɜːd ɒv/adjsomething that is unheard-of has never happened before and seems surprising 闻所未闻的，空前的:◇women airline pilots were practically unheard-of twenty years ago. 二十年前，女性机师几乎闻所未闻。 |
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