儿童英语小故事两分钟 -冰上跳舞 When the ice is that thick it becomes possible to actually drive a car or truck across the ice. While driving on ice sounds like something that people would do just for fun, a lot of people drive across frozen lakes for very practical reasons. For example, there are people who live year-round on islands within these northern lakes. In the middle of winter the only practical way of traveling to the mainland is by driving across the frozen lakes. Actually, when the lake is frozen two to three feet deep, this is a perfect opportunity for people living on islands to transport large objects onto or off the islands. Say, for instance, you owned a cabin on a small island in the middle of a lake in Michigan. Suppose you decided that you wanted to build an extra room onto the cabin. Transporting all the building materials onto the island using a boat would take a lot of work and expense. But if you waited until winter, you could easily drive all the building materials across the lake. How can you tell if a lake is frozen solid enough to drive on? The surest way to know is to wait until several other cars and trucks have safely driven across the ice. Even then, you should always be extra careful when driving across a frozen lake. Its possible that one section of the lake has currents that prevent the lake from freezing solid. Or there might be a river or stream that brings slightly warmer water into one part of the lake. So even though most of the lake was frozen solid, one section of the lake could have thin ice. Usually it takes at least two to three weeks of very cold weather before deep ice is formed on a lake. Here in the northern United States, deep ice doesnt form until mid- January, at the earliest. (In northern Canada and Alaska lakes sometimes freeze solid as early as November or December.) Do the tires of cars slip when they drive across ice? Yes, sometimes they do. But almost every car and truck that drives on ice has snow tires, which creates extra friction between the tires and the ice. Some people also choose to put chains on their tires, which gives the tires an even stronger grip against the ice. After a few cars have driven across a particular path on a lake the ice actually becomes a sort of road. If you walked up to such a road and did not know that the road was traveling over a lake, you might never suspect that the cars and trucks are actually driving across solid ice. 当冰是厚的，它就能够在冰上驾驶汽车或卡车。虽然在冰上驾驶 的声音，人们会做的仅仅为了好玩，很多人开车穿越结冰的湖泊非常 实际的原因。 例如，有人在这些北方湖泊中常年生活在岛屿上。到了冬天，到 大陆旅行的方法就是穿过结冰的湖泊。 事实上，当这个湖被冻结2 到三英尺深的时候，这是一个很好的 机会，人们生活在岛屿上，把大的物体运送到岛屿上。比如说，你在 密歇根的一个小岛屿上拥有一个小木屋。假设你决定要在客舱内建造 一间额外的房间。 用一条船把所有的建筑材料运到岛上，会花费很多的工作和费用。 但是，如果你等到冬天，你能够很容易地驾驶所有的建筑材料在湖。 你怎么能告诉你，如果一个湖是冻结的固体足以驱动？知道的最 可靠的方法是等待几辆车和卡车安全地穿过冰。即使在那，你也应该 小心开车穿越一个结冰的湖。 湖的一个部分有一段水流，能够阻止湖水结冰。或有可能是一条 河流或小溪，带着稍微温暖的水进入湖的一部分。所以，即使绝大部 分的湖泊是冰冻的固体，一部分的湖可能有薄冰。 在一个湖上形成冰之前，通常需要至少2 到三个星期的寒冷天气。 在这里，在美国北部，深冰不形成，直到一月中旬，在最早。（在加 拿大北部和阿拉斯加的湖泊，有时也会像十一月或十二月那样被冻 结。） 当他们开车穿越冰时，汽车的轮胎打滑吗？是的，有时他们做。 但几乎所有的汽车和卡车，在冰上驾驶的雪轮胎，这会造成额外的摩 擦之间的轮胎和冰。有些人还选择把链放在他们的轮胎，这给了轮胎 更强大的抓地力，对冰。 几辆车经过一条特别的道路，在一个湖上，冰实际上成了一种道 路。如果你走到一条路，不知道路是在湖上行驶，你可能永远不会怀 疑，汽车和卡车实际上是在固体冰上行驶。