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同学们,你们那里冬天下雪吗?你是否注意到平地的雪最厚,山坡越陡雪越薄, 下面来说明其中的道理．
Students, where do you snow in the winter? Do you notice that the snow on the plains is thickest, the steeper the slopes on the slopes are, the thinner the snow is. Here’s how to explain them.