时文摘要：位于加拿大和美国边境的尼亚加拉大瀑布，偶遇极端寒潮来袭，部分水流结冰，形成罕见的“冰瀑”景观。
The Niagara Falls is a popular place for visitors. It is a group of three waterfalls between Canada and the US. They are more than 50 meters high.
尼亚加拉大瀑布是一个受游客欢迎的地方。这是一个由三个瀑布组成的瀑布群，位于加拿大和美国之间。它们有50多米高。
The falls freeze in December. People can see thick ice on the top of the falls. It seems that the water does not move. It is not possible. The river is very strong. There is so much water that it can never freeze. Water still runs under the ice.
该瀑布在十二月会结冰。人们可以看到瀑布顶部有厚厚的冰。水好像不动了。这是不可能的。这条河很厉害。里面有很多水，所以永远不会结冰。水仍在冰下面流动。
The falls freeze only once. Ice from Lake Eerie stops the river and it freezes. It cannot happen today. A special steel construction (钢结构) stops the ice. It does not get in the river.
瀑布只结冰一次。伊利湖的冰阻挡了河流，河就结冰了。今天不可能发生了。一种特殊的钢构可以阻止冰。它进不了河。
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