Mechanic tool clamping with belleville washers, hydraulic release.

机械工具配备有酸模衬垫、液压释放装置。

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Stop the engine and release the pressure in the hydraulic system.

停止发动机，释放液压系统的压力。

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Hydraulic disconnects rely on the application of a predefined pressure through the running string to activate a release mechanism.

通过下入管柱施加一个预定的压力来实现水力断开，于是启动释放机构。

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Many federal and state regulators say hydraulic fracturing, which injects a mix of water and chemicals thousands of feet underground to crack open shale and release natural gas, is safe when done properly and thousands of sites have few complaints of pollution.

NPR: AP: NY Fracking Held As Cuomo, RFK Jr. Talk Health

"Hydraulic fracturing in a well for shale gas development, which involves injection of fluids to fracture the shale and release the gas up the well, has been confirmed as the cause for small felt seismic events at one location in the world, " the report states.

CNN: Debate over fracking, quakes gets louder