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因為結冰首先要有一個支點,他是有這個支點慢慢向周圍擴散的,比如冬天,你在一個桶裏放一根木棍另一個沒放木棍,同等情况下,你會發現放木棍的先完成桶面的結冰.瀑布的水流一般比較急,很難生成一個這樣的支點,且流水也會溶化冰,如果溶化的速度大於結冰的速度,那麼瀑布不結冰也沒什麼.
當然是兩格
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