The cleaning machine on the market today can not have a certain strength of investment casting shells for efficient cleaning.

目前市场上的清洗机无法对具有一定强度的熔模铸造壳体进行高效清洗。

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Light emitted in this environment will have a certain frequency, which is related to the time scale (or the gravity strength) of the environment.

在那样环境下所发射的光会具有一定的频率，这个频率是与环境的时间标度(或引力强度)有关。

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Some beginner runners are actually physically fit enough to run a certain distance, but they don't have the confidence or mental strength to push themselves farther.

一些新手其实身体上足够适合跑一段距离的，但是他们没有信心或精神力量来促使他们跑的更远。

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It's - a suture or a stitch has to hold the wound closed so it has to have certain mechanical strength and imagine the problem of making something that's dissolvable so it disappears but also is strong enough to hold a wound closed reliably for a length of time.

能够拉紧切口的缝合线,就必须具有一定的机械张力,大家想像一下制造这种缝合线的难度,身体组织不仅要能吸收这种缝合线,而且这种线必须有足够的张力,一定时间内能够拉紧切口

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However, since 2007, dietary supplement manufacturers are required to follow certain guidelines to ensure they're pure, have a consistent strength and are manufactured appropriately.

WSJ: Vitamins Become Growing Business for Consumer-Product Companies