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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Conclusions: Embryonal rhabdomyosarcoma of the biliary tree, though rare, is the most common cause of biliary obstruction due to malignancy in childhood.

结论：胆道胚胎型横纹肌肉瘤极罕见，但小儿胆系恶性肿瘤多为该种肉瘤。

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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