This unbroken connection has led to the formation of rich plant associations rarely seen elsewhere in the world.

这种不间断性导致了丰富的植物群丛的形成，在世界上其他地方是罕见的。

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Africa has the highest rate of child disablement in the world. Some think 10-20% May be disabled, a staggering number, but since they are rarely seen in clinics and schools that is hard to verify.

非洲的孩子残疾率是全世界最高的，有人认为这个数字大概在10 - 20%左右，这已经足够令人震惊了，但考虑他们鲜见于门诊室和学校，很难得出确切的数字。

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Such a large-scale social transformation is rarely seen in the world. The difficulties we are facing and trying to resolve are unimaginable and rarely encountered by any other countries.

如此规模的社会变革是世所罕见的，我们面临和要破解的难题也是其他任何国家都不曾遇到和难以想象的。

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The world has rarely seen an intellect as voracious and comprehensive as Aaron's.

CNN: Why the Net grieves Aaron Swartz

It is divided into 12 zones reflecting where the trees originate and there are many species from all over the world, including some examples rarely seen in Britain.

BBC: Jersey unemployed used to plant trees

This machine could take passengers over a 1, 000 feet below sea level allowing them to explore marine life rarely seen by the world.

FORBES: Submarines For The Super-Rich