Why should that apple always descend perpendicularly to the ground, thought he to himself... Why should it not go sideways, or upwards?
他心想，为什么苹果总是垂直落到地面？
They drill down to the shale, then go sideways and inject high-pressure water, sand or other material into the rock.
当钻到页岩时，从侧面将高压水、沙子和其它东西注入页岩内。
They drill down to the shale, then go sideways and inject high-pressure water, sand or other material into the rock.
当钻到页岩时，从侧面将高压水、沙子和其它东西注入页岩内。
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