Ma Ning thinks that religion can't exist alone, it must grow together with life.

马宁认为信仰并不可能单独存在，而是必须要与生命成长同步。

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A species does not exist alone in the nature world, so disease can spread between different species.

然而一个种群在自然界中并不是孤立存在的，这使得传染病可能在不同物种间传播。

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Fourth, the network world is a part of the real world, it can not be dissociated from the real and exist alone.

第四，网络世界是现实世界的一部分，它不能游离于现实世界而单独存在。

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Ultimately, if there was a diet that really worked for everyone, the dieting industry wouldn't exist, let alone be a multibillion dollar one.

BBC: Atkins and the never-ending battle over carbs

That would imply that tens of billions of such worlds exist in the Milky Way alone.

ECONOMIST: Extra-terrestrial life

There is little justification for more than a couple of Landesbanks, which act as wholesale banks for the savings banks, let alone the nine groups that exist.

ECONOMIST: German Landesbanks