形容词
中文翻译：不频繁的
同义词：
['rare', 'intermittent', 'occasional']
例句：
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1. The rarebird species is listed as a protected one.
这种稀有鸟类被列为受保护物种。
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2. Heoccasionally visits his old friends.
他偶尔会去拜访他的老朋友。
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3. Infrequentvisitors are welcome to stay at the hotel.
偶尔来访的客人可以免费入住酒店。