seldom seen;rarely seen;rare;infrequence;infrequency ;

It remained an exceptionally rare book until it was reprinted in 1918.
在1918年再版之前,这本书一直非常罕见。
来源:《柯林斯高阶英汉双解学习词典》Women are still something of a rarity in senior positions in business.
在商界位居高职的妇女仍然十分罕见。
来源:《牛津高阶英汉双解词典》He'd dyed his hair, which was almost unheard-of in the 1960s.
他染了头发,这在20世纪60年代是罕见的事。
来源:《牛津高阶英汉双解词典》
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