When the diffractive optical lens is illuminated by white light, its focal length not only relates to material dispersion and wavelength dispersion, but also to aperture factor.

在白光照射下，衍射光学透镜的焦距不仅同材料色散和波长色散有关，而且还同孔径因子有关。

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For the same water depth and same aperture, the gas flow was the major factor for effecting the bubble size and velocity.

对于相同的水深和相同的孔径，流量是影响气泡大小和速度的主要因素。

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The experimental results show that the loss factor and damp ratio decrease, the resonance frequency increases with increase of the aperture of the piston in the damper.

对阻尼器不同孔径进行了对比试验，试验结果表明：随着活塞孔径的增大，阻尼器的损耗因子和阻尼比减小，共振频率增加。

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