The refractive index of ice crystals depends upon the polarization and propagation direction of a beam of light .

冰晶的折射率取决于一束光线的偏振和传播方向。

The argument goes like this . Many plants depend on fire for their propagation .

论证如下：很多植物依靠火焰繁殖。

I am careful to point this out , because it 's easy to mistake them for an organisation dedicated to the promotion of sex with vegetables or the propagation of self-loathing , misogyny and pamela anderson .

我谨慎地说明这点，是因为大家很容易误会该组织要提倡和植物性爱，或者宣传自我厌恶、厌女症和帕米拉安德森。

The scientists checked records for vulnerable faces of the antarctic coast and studied models of the likely wave propagation .

科学家们检查了南极洲易损表面的记录并且建立了最有可能的海浪传播途径的模型。

A fuller understanding of the propagation of sound waves had to wait until more elaborate mathematical techniques were developed .

对声波传播的进一步了解必须要等到更精密的数学技术开发出来。