Ray equation is derived from Fermat's principle in variation form.

本文由费马原理的变分形式，导出光线微分方程。

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And there was no clear-cut correlations between the variation form and the sequence mode.

而且，这种变化形态与地震序列类型无明显的关系。

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Eyes and feet have been optimized to function on our planet, so perhaps some variation will be found attached to a life form thriving on a distant world.

眼睛和脚是我们这个星球上最优化的官能，也许在遥远的星球上的生命形式上我们能发现其他的不同。

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Some may call it heresy, but any methodology subject to so much variation, imprecision and even manipulation should not form the basis for equity valuations.

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"She'd compare a step to a flower, or take off her necklace and say how all the beads have to be perfectly put together to form the whole (dance) variation, " said Lola Cooper, a Carolina Ballet dancer who studied with Kostritzky at the School of American Ballet.

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