unheard-of
柯林斯词典
1. ADJ An event or situation that is unheard of never happens. 没发生过的[v-link ADJ]
Riots are almost unheard of in Japan. 暴乱在日本几乎是闻所未闻的。
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unheard of /ʌnˈhɜːd ʌv/
剑桥词典
- surprising or shocking because not known about or previously experienced
令人震惊的；前所未闻的，空前的
It was unheard-of for an unmarried couple to live together. 未婚同居，这在以前是闻所未闻的事。 返回 unheard-of