On Earth, for example, platinum and its allied elements, though rare at the surface, are reckoned more common in the planet's metal-rich core.

例如在地球上，铂和铂系元素在地表上虽然罕见，但人们认为在富含金属的地核里却是较为常见的。

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Intracranial lipomas, though rare, can occur anywhere, and a diagnosis can be confidently made when appropriate signal characteristics are present.

颅内脂肪瘤，虽然少见，但是可以发生在任何部位，并且可以通过其表现的信号特征而获得诊断。

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Botulism, though rare is a potentially fatal form of food poisoning and can cause general weakness, dizziness, double-vision and trouble with speaking or swallowing.

肉毒中毒是一种罕见的可致死的食物中毒，可引起全身虚脱、头晕、复视、以及说话吞咽困难。

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But it's a very,very rare dinosaur,". Though dinosaur researchers have made giant strides in recent years,they know they have much more to learn.

VOA: standard.2009.12.08

However, large-scale natural disasters--though rare and well spaced out in time--undoubtedly have that power.

FORBES: Magazine Article

She said that Bextra is still an important option for patients, but said that both side effects, though rare, are serious.

FORBES: Pfizer Says FDA Warning Likely For Bextra

The selective switching off of genes that have come from one or other parent is called imprinting and, though rare, is not unknown.

ECONOMIST: Genetics and behaviour