We can raise any number to the fourth power by squaring it twice.

我们能把任一数平方两次就得到它的四次方。

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Airy disk brilliance (the brightness of a point-source stellar image) is proportional to the fourth power of aperture.

艾里斑的亮度(点光源恒星的图像亮度)正比于孔径尺寸的四次方。

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Stem stiffness depends on the elastic modulus of the material and is proportional to the fourth power of the diameter.

假体柄的刚度由制备材料的弹性模量决定且与直径的4次方成正比。

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That quantity in parenthesis, I have a mass which is a positive number. Something raised Something raised to the fourth power has got to be positive.

顺便说一句,质量这个量是个正数,四次方的值,肯定是正数。

麻省理工公开课 - 固态化学导论课程节选

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