Isthmic spondylolisthesis is a lumbar spinal condition in which a fracture of the isthmus causes one vertebral body to slip forward on top of the vertebral body below it.

峡部裂性腰椎滑脱是由于峡部裂使一个椎体在另一个椎体上面滑动产生的一种病症。

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If you have a slip up and start to let those doubts creep in, recognize it, alter it, and move forward.

如果你有个艰难的开局，并让疑问悄悄侵蚀你的目标，认清目标，摒除疑问，并坚定地向前进。

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And again-without collective, bold, action, there is a real risk that the major economies slip back instead of moving forward.

如不采取集体和大胆的行动，一个现实的风险就是主要经济体将不进反退。

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Mr Ash, a retired professional train driver with more than 50 years' experience, said it was possible he did not lock a reversing lever into place, which could have allowed the locomotive to slip between forward and reverse.

BBC: North Yorkshire Moors Railway death: Family to sue

When adapted to all-wheel drive, all three companies have kept that rear-drive feel as the default--only when the rear wheels slip does power get sent forward to the front tires.

FORBES: Overview

As a loose-lipped executive recently let slip, we can look forward to a 50 percent increase in battery life in the coming wave of devices, with no loss of performance.

ENGADGET