或者，添加与地平面垂直的、计算出透明度的透明图形，创建针对所有视角的更真实的分层效果。
Or add transparent graphics with computed transparencies perpendicular to the Earth plane to create a more realistic layered effect for all viewing angles.
你有三种选择：使用平面图像模拟的透明度，使用不能跨浏览器兼容的PNG格式，或者去折腾CSS基本的透明选择器和滤镜。
You had three choices: simulate transparency using flat images, deal with PNG's cross-browser incompatibilities, or struggle with CSS 'basic transparency selectors and filters.
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