Artificial intelligent assistant

rarity

rarity
/ˈreərətɪ; `rɛrətɪ/ n
1 [U] rareness 稀有; 罕见.
2 [C] thing that is uncommon or unusual; thing valued because it is rare 稀有的事物; 因稀少而珍贵的东西
    Rain is a rarity in the desert. 在沙漠中雨是很少见的.
    ancient scrolls and other rarities 古书卷等珍品.

牛津英汉双解词典

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