美國經濟與可負擔性是這次談話的核心主題。這也是數十年來最長的一次美國國會演說。特朗普也對非法移民，以及結束世界各地一系列戰爭等議題作出了多項主張。
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You look at a region of the image. If all the pixels are roughly the same color (below some threshold), you store the average color for the whole region as a single value. If the pixels vary too much, you split the region into four quadrants and try again.