当用户在当前窗口之上再打开一个新窗口时，可能会对焦点变化感到疑惑。
Confusing changes in focus can happen when the user opens a new window on the top of the current one.
这个算法使用高度图，也使用几何变换，但是它将高度图和小块地形分开，所以当焦点变化时，不需要重新生成所有的小块地图。
This algorithm takes a height field and also converts it into geometry, but it splits the terrain up in smaller chunks, so when the focal point changes, not all chunks have to be regenerated.
在过去的十年里，人们关注的焦点一直是气候变化，即温室气体导致的地球变暖是如何导致火灾恶化的。
Over the past decade, the focus has been on climate change—how the warming of the Earth from greenhouse gases is leading to conditions that worsen fires.
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