Screw pump is a kind of rotary pump, when the outlet end is blocked, the pressure will gradually increase, so that more than a predetermined pressure value.

螺杆泵是一种容积式回转泵，当出口端受阻以后，压力会逐渐升高，以至于超过预定的压力值。

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The squeezing stress between the valve end the screw for adjusting valve clearance must be taken into account in designing high speed valve train.

高速配气机构设计中一个不可忽视的薄弱环节是气门间隙调整螺钉头部的挤压疲劳。

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To this end, we as small as a screw, every process, every material, are fundamental to ensure product quality.

为此，我们小到一颗螺丝钉，每一道工序，每一样材质，都从根本上确保产品的质量。

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Numbers of livestock have fallen by 40%, partly thanks to an epidemic of screw worms that had spread to two-thirds of Iraq's provinces by the end of last year.

ECONOMIST: Iraq