图片提示：当拍摄一个熙熙攘攘的人群场景时，尤其重要的是，你要抓住在一片混乱中，发生特殊而又值得重视事情的那一瞬间。
Photo Tip: When shooting a bustling crowd scene, it's especially important that you capture a moment, a specific something happening amid the chaos.
但是，近年来拍摄的卫星图片显示，在海面上，尤其是大西洋南部地区，形成了大型气溶胶云层。
But satellite images in recent years have shown large aerosol clouds forming above the oceans, particularly in the southern part of the Atlantic.
不像人工场景，自然条件下的拍摄条件无法预计，这一点就显得尤其重要。
This is particularly important in natural surroundings in which, unlike within a controlled man made situation, conditions can be unpredictable.
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