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Molten lava from a volcano will solidify as it cools.
The shuttle bus makes my commute to work convenient.
The wildlife refuge keeps linons and other animals safe from hunters.
The digestive tract allows your body to use foot for energy.
This product is formed as a syhthesis of many different chemicals.
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原文地址：http://www.cnblogs.com/z-sm/p/4890044.html
