The hunter spotted paw marks of a rarely seen animal on the snow.

猎人在雪地里发现了一种罕见的动物爪印。

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This paper introduces a rarely seen method of describing with diametral distance.

本文介绍了一种鲜为人知的用直径距离描绘椭圆的方法。

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Aside from a fabulous hue, these Tourmalines exhibit a rarely seen "high" level of clarity.

除了具有非常美丽的色调之外，这些碧玺还显示出一种非常少见的高等级的纯净度。

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"so we wanted to highlight our concerns by promoting a positive image of Islam which is rarely seen in the mainstream."

VOA: standard.2010.07.19

Visitors to Jane Austen's House Museum, in Chawton, Hampshire, can view a rarely seen letter in which Austen says the novel is "my own darling child".

BBC: Jane Austen museum in Hampshire displays rare letter

It marked a reversal of a kind rarely seen in Washington, and a sign of a new political force: a bitroots campaign.

FORBES: What Does Silicon Valley Need from Washington? Less.

Many are now open to hikers and make for a fascinating, if dank, subterranean tour of a world rarely seen.

BBC: In Swiss utopia, the devil dwelled