Children and teens with a cold or flu should not take aspirin for pain relief because of the risk of Reye syndrome, a rare but serious condition of the liver and central nervous system.

患有感冒或流感的儿童和青少年不应该服用阿司匹林来缓解疼痛，因为这会有雷氏综合症的风险，雷氏综合症是一种罕见但严重的肝脏和中枢神经系统疾病。

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Such a move is rare, but not unprecedented.

这样的举动少见，但并非从来没有过。

《柯林斯英汉双解大词典》

It is not rare that major roads are choked with traffic in rush hours.

在交通高峰期，主要道路出现交通堵塞的情况并不少见。

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And they are not rare. Bird Strike Committee USA gathers information about such incidents in the United States and around the world.

VOA: special.2009.04.01

In rare, but not unheard of, cases, some people begin to have those unusual biological processes and then return to the normal biological processes and can talk about what was happening in the unusual biological processes.

在少见,但并非从未听闻的,情况下,有些人开始,经历那样一些不正常的生理过程,然后回归正常的生物学过程,他们可以谈论,在那个不正常的生物过程里发生了什么

耶鲁公开课 - 死亡课程节选

It's perfectly fine, but they envy us for our finite lifespans, because what we've got and they don't have is something that's for each individual rare-- something that's not lasting, something that's precious in that way.

不朽很好，但他们羡慕我们的有限寿命，因为我们有而他们没有的是,对每个人来说稀有的东西-,不会永远持久的东西，从那个层面讲珍贵的东西。

耶鲁公开课 - 死亡课程节选

Creative individuals are rare, but not so rare that only those who are famous can be given the label.

FORBES: Magazine Article

In the NHL, it's also rare, just not that rare.

WSJ: A Thousand Memories for Manchester United's Giggs

For rare earths just are not rare.

FORBES: The Coming Glut of Rare Earths