This is another reason to go into Eight Limb pose (knees touching aiding in support) instead of Four Limb pose (without the knees touching).

这也是为什么用八支(双膝触地支撑)取代夹肘俯卧撑(双膝不触地，四个点：双手，双脚着地)的另一个原因。

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And so it happened that we reached the pass at six, not at four, near collapse, and with a certain trembling in our knees that wasn't just from exhaustion.

我们恰巧在六点钟到达了那个要隘，而不是四点钟，膝盖颤抖着，不仅仅是由于筋疲力尽，简直要崩溃了。

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The researchers tested the technique on 425 people, who each had four X-rays taken of their knees.

研究人员运用这个技术用在425个人的身上，给每人的膝盖拍下了4张X光图片用来测试。

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Worn over the legs with a harness that reaches up the back and around the shoulders, X1 has 10 degrees of freedom, or joints -- four motorized joints at the hips and the knees, and six passive joints that allow for sidestepping, turning and pointing, and flexing a foot.

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And what they have done in four short years and I shudder to think what the next four holds for the United States, but they're leaving America on her knees, staggering, bleeding, and leaving the rest of the world to run amok.

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Despite creaky knees and a reckless style, he remained healthy and won three of the four Grand Slam tournaments in 2010, including the U.S Open, which gave him at least one victory at all four majors.

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