原因之一就是新技术，例如水力压裂法。
One reason is new technology, such as hydraulic fracturing, also known as fracking.
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使用水力压裂法时，高压液体被压入地下。
In fracking, liquid is forced into the ground under high pressure.
另外一个担心就是水力压裂法可能会引起地壳震颤。
Another fear is that fracking may cause earth tremors.
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