因此，可以通过密度求一个平面物体的质量。

So, you can get the mass of a flat object with density.

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通过系联诗歌韵脚字，考求诗文韵部系统是音韵学研究当中的一种重要方法。

Unite the poem rhyming word is an important method in the study of Chinese phonology.

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该方法通过二次曲面求管线表面轮廓方程进而求得管线的型值点集。

With this method, shape points were calculated by surface outline equation got from quadratic surface.

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该方法通过二次曲面求管线表面轮廓方程进而求得管线的型值点集。

With this method, shape points were calculated by surface outline equation got from quadratic surface.

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