rarer
词形变化：
形容词: rarefiable |
同义词：
seldom | hardly ever | infrequently | once in a blue moon | hardly |
反义词：
often |
rarer
词形变化：
形容词: rarefiable |
同义词：
seldom | hardly ever | infrequently | once in a blue moon | hardly |
反义词：
often |