有越多的顾客使用这个产品，它就能产生越多的价值，而转移成本也会变得越高，而在某一点处，它会达到一个使用限制，用户想要突破这一限制就必须付出一定的费用。

The more a customer uses the product, the more value she derives, the higher the switching costs are, and at some point she’ll hit a usage limit and convert to a paying customer.

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它们位于脑室管膜内、室管膜下，或距室管膜有一定距离处，但有突起伸至第三脑室。

They were located in the ependymal layer, subependymal layer or region with some distance to the ependyma, sending processes into the third ventricle.

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正是由于这种独特的地质结构，使赣州成为了世界著名的钨矿聚集区，已探明有一定储量的矿区106处，钨矿资源保有储量占全国的30%左右。

This unique and complex geological structure makes Ganzhou a famous area of tungsten resources in the world, reserves106 mining areas and more than 30%of total reserves of China.

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