Such a move is rare, but not unprecedented.
这样的举动少见，但并非从来没有过。
But white tigers are rare genetic mutations, not a different species.
但白虎仅仅是一种罕见的遗传变异，而不是一个不同的品种。
但是，这种成功极为罕见。
Both diseases are rare, but have a capacity to cause dramatic outbreaks with high fatality.
这两种疾病极为罕见，但有引起剧烈暴发的潜力，且病死率很高。
But until the age of the Internet, anonymity was a rare thing.
但是到了互联网时代，匿名性是个稀奇的事情。
But it also offered a rare chance of leisure.
但是它也提供了一丝放松的机会。
But that's a rare success story.
但是这是极少的成功例子。
他做了个少见的决定。
Veterinarians say such a foal is rare, but not unknown.
兽医们表示这样的杂交斑马驹虽说不是没有过，还还是很少见。
This was an extremely rare incident but Yang's tragic experience should ring a big alarm.
朱倩说：“这是一个极端罕见的以外，但是杨的悲剧经历应该拉响警钟。
You'd think it would be a rare mistake, but it's surprisingly common.
你认为这将是一个罕见的错误，但这是惊人的相似。
Cushing's syndrome is a serious but rare disease.
柯兴氏综合征是一种严重但罕见的疾病。
This is a rare event, but it is up to you to prove who is responsible.
这是一个千载难逢的盛事，但它是由你来证明，谁负责。
Background Abductor mechanism insufficiency after total hip arthroplasty is a rare but debilitating problem.
背景全髋关节置换术后外展肌无力是个罕见但易导致功能不佳的问题。
This is a tearful story but it's not rare in our community.
这真是一个令人惋惜的故事，但却是不停在我们社群中发生。
Although the woman's beauty, but also in essence, is a rare resource.
虽然女人的姿色，也实质上是一种难得的资源。
But this month saw a rare public return to the fray.
但是，这个月发生了罕见的领导人公然回归争吵局面的事情。
But it was a rare gladiator indeed who could survive multiple fights.
但事实上，一个能在多场战斗中存活下来的角斗士非常罕见。
But there was a problem. Transits of Venus are rare.
但有个问题，金星凌日很难得。
This is a rare situation, but it does occasionally occur.
这种情况非常少见，但是仍有可能发生。
But this is rare, a mystery, and a gift of God.
但这是罕见的，是上苍的奥秘和恩赐。
But then it was rare even to see a car on the road, let alone drive one.
但是当时连在路上看到汽车都很少，更不用说是开汽车了。
Veterinarians say such a foal is rare, but not unknown.
兽医们表示这样的马驹虽然很少见，但并不是没有过。
Wire migration is believed to be a rare but potential complication.
而钢丝游走是较为罕见的潜在的并发症。
He's a rare one, but he belongs …
它是一条珍奇的蛇，但它属于……
But, as you noted, the opportunity to win a title is a rare occurrence.
但是，像你说的那样，夺冠机会很少发生。
But a cookbook that does that is a rare treat.
但菜谱说这是否是一种罕见的对待。
But a cookbook that does that is a rare treat.
但菜谱说这是否是一种罕见的对待。
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