U6W2 Wind Power

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Wind Power

风能

CHAPTER 1 WHAT IS WIND? Have you ever been outside on a windy day?What did the wind feel like? Could you feel it push against you as you walked? The wind can blow a leaf off a tree, keep a kite in the sky, or even push a sailboat. For thousands of years, people have used wind power to sail across rivers and seas. People had sailboats in ancient Egypt. They sailed up and down the Nile River. They would load their sailboats with goods and carry them down the river. Later, people set sail from Europe. They sailed across the oceans. They discovered new places, including the Americas. Some people even used sailboats to travel around the world The mainsail captures wind energy to move the sailboat.

第1章 风是什么? 你有没有在刮风的日子到户外去过?风给你的感觉是什么样的?当你行走的时候，你能感觉到它在推你吗?风可以把树叶从树上吹落，能让风筝在空中飞舞，甚至还能推动帆船前行。 数千年来，人们一直利用风能来渡河和跨海航行。古埃及人就有帆船。他们在尼罗河上往返航行。他们会把货物装上帆船，然后顺着河流运输。后来，人们从欧洲起航。他们穿越大洋。他们发现了新的地方，包括美洲。有些人甚至乘坐帆船环游世界。 主帆捕获风能以推动帆船前进。

Just what is wind, anyway?Wind is moving air. The wind can be breezy and calm. It can also be very powerful, causing damage to our homes. Wind has kinetic energy, the force that moves things. Wind gets this energy from the sun. First the sun's heat warms the air. Warm air, which is lighter than cool air, rises up. Then cooler air takes its place. This moving air is the wind. Cool air Warm air Energy from the sun warms the air over land more quickly than the air over water.

那么，风到底是什么呢?风是流动的空气。风有时轻柔，有时平静，有时也会非常强劲，对我们的家园造成破坏。 风具有动能，也就是使物体移动的力量。风的能量来自太阳。首先，太阳的热量使空气变暖。暖空气比冷空气轻，所以会上升。然后冷空气就会取代它的位置。这种流动的空气就是风。 冷空气 暖空气 来自太阳的能量使陆地上的空气比水面上的空气升温更快。

CHAPTER 2 WINDMILLS Sailboats were not the only way that people used wind power long ago. They also built windmills. Windmills help capture energy from the wind. They make it possible for us to use wind power to do work. Let's take a closer look at windmills. They have long arms. These arms move in a circle when the wind blows on them. The turning arms provide power for machines inside the windmill. This windmill was built in 1902 to pump water in Golden Gate Park in San Francisco, California.

第2章 风车 很久以前，帆船并非人们利用风能的唯一方式。他们还建造了风车。风车有助于捕获风能。有了风车，我们就能利用风能来做功了。 让我们更仔细地看看风车。它们有长长的臂杆。当风吹到这些臂杆上时，臂杆就会绕圈转动。转动的臂杆为风车内部的机器提供动力。 这座风车于1902年建于加利福尼亚州旧金山的金门公园，用于抽水。

The History of Windmills People can use windmills to pump water. In the 1800s and 1900s, Americans built windmills for this purpose. Many people had ranches and farms in dry places. They couldn't just haul buckets of water from rivers. Instead, people used windmills to pump water up from deep underground. Then they could use the water for drinking, cooking, watering crops, and feeding farm animals. On dry ranches in Texas, windmills are used to pump water for cattle.

风车的历史 人们可以利用风车来抽水。在19世纪和20世纪，美国人出于这个目的建造了风车。许多人在干旱地区拥有牧场和农场。他们不能只是从河里提水桶取水。相反，人们利用风车从深深的地下抽水。然后他们就可以用这些水来饮用、做饭、浇灌庄稼和喂养农场动物。 在得克萨斯州干旱的牧场上，风车被用来给牛抽水。