Flexible disc springs automatically provide leak tightness by exerting pressure, which keeps the upper and lower valve sealing rings compressed at all times.

柔性盘簧始终使上、下阀门密封环处于受压状态，自动密封防漏。

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Protrusion of lumbar intervertebral disc is the common diseases in the lower lumbar spinal canal.

腰椎间盘突出症是下腰部椎管内较常见的疾病。

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Objective To evaluate the clinical value of pedicle fixation and bone grafting for the treatment of degenerative lumbar disc diseases coupled with lower lumbar spine instability.

目的探讨使用椎弓根内固定加植骨治疗腰椎间盘退变性下腰椎不稳症的临床价值。

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The 20-something athlete hurt his knee running track five years ago so he switched to disc golf, a lower impact game.

VOA: standard.2010.08.03

Our "road tax" (i.e. the tax disc) is actually significantly lower in cost than in mainland Europe, and in terms of other taxes, notably income tax, we pay far less than the other European countries.

BBC: How can we improve UK transport?