而如果这两种介质的密度相差较大，就像空气和水那样，那么大部分的能量将会折射回来，只有一小部分会继续传播进入到新的介质中。
If the two media have really different densities, like air and water, then most of the energy is going to be reflected back, very little of it will keep going and get transmitted into the new medium.
大部分较大的组织的应用程序都至少有三种环境。
Most larger organizations have at least three environments for their applications.
重量较大的氧来自某种自然过程，在此过程中，大部分的轻同位素留在了形成太阳的部分星云中。
And the heavier oxygen from a natural process that left more of the light isotope in the part of the nebula that made the sun.
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