Cataclysmic housing crises are easy to spot, but also rare.

灾难性住房经济危机容易发现，却也很少发生。

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A survey, published last month, of land managed by Britain's 5, 000 gamekeepers found that not only do they protect many rare species, but they also look after 1.3m hectares of land.

上个月发表的一份调查报告是关于英国由5000名猎场看守管理的土地，调查人员发现看守们不仅保护了许多稀有物种，他们还照看着130万公顷土地。

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But it also offered a rare chance of leisure.

但是它也提供了一丝放松的机会。

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The Buffalo Trace distillery by itself produces not only its namesake bourbon, but also Eagle Rare, Blanton's, George T.

WSJ: Bourbon Mania!

Louise was one of those people who could not only sing and perform well and in any situation, but also had a rare understanding of people.

BBC: NEWS | UK | Wales | Friends made 'beautiful tapestry'

But they are also rare: the completion rate for the first MOOC, a course on artificial intelligence offered by Stanford in 2011, was 13 percent.

FORBES: MOOCs: A College Education Online?