The bulge of our spherical Earth blocks sunlight from the far hemisphere at the solstices; that same curvature allows the sun's rays to spread over more area near the top and bottom of the globe.

由于地球的球面形状，在至日突出的表面阻挡了阳光照射照远端的半球；同样是球面的原因，在至日阳光可以照射两极的更多地方。

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Over those distances, even a sharp laser beam would spread to thousands of kilometres wide by the time it reached Earth.

在这种距离下，即便是聚焦良好的光束到达地球时也会分散到上千公里宽的面积上。

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Capturing sunlight and putting it to work is difficult because the solar energy that reaches the earth is spread out over such a large area.

由于到达地球的太阳能散布地域之广，使得捕获阳光并付诸利用变得非常困难。

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So how are we to account for the diversification of languages, the spread of different ethnic linguistic groups throughout the lands of the earth if we all come from one common creative moment, one common ancestor?

所以，如果我们都起源于同一个时刻，来源于,同一个祖先，那又要怎样解释语言的多样性，怎样解释,使用不同语言的族群遍布地球上的所有土地,这一现象呢？

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Ocean hits are worse than land hits, not just because of immense tidal waves, but because of the vast quantities of super-heated water vapor and dust that spread from the impact to shroud the entire Earth.

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Radioactive isotopes accumulate in milk after they spread through the atmosphere, fall to earth in rain or dust, and settle on vegetation, where they are ingested by grazing cattle.

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Then the air grew still and warm and, after a moment in which the earth seemed to draw its breath, the morning sun spread in a rush over the plantation.

NPR: E.L. Doctorow on Sherman and 'The March'