Ford claims that when wells are properly built , as they usually are , fracking is safe .

他说，如果天然气井建设合理（一般来说确实如此），水力压裂技术是安全的。

Fracking and gas drilling have caused controversy across the country .

水力压裂和天然气钻探已经在全美引发了争议。

Another worry is that fracking may cause earthquakes .

还有一种担忧是压裂会引起地震。

Critics fear that fracking can contaminate ground and surface water or even cause gas to leak into domestic water supplies .

评论家认为这种致裂法会污染地下水和地表水，甚至导致天然气泄漏到民用给水中。

Local opposition to fracking could leave vast tracts of the shale gas undeveloped .

地方上存在反对意见会导致大片页岩气矿脉得不到开采。