远古人们，在炎热的夏天，只有躲在树阴下或用树叶代替扇，后来，随着人类的发展和经验的总结，制造了各种各样的扇——有竹扇、麦扇、折扇、蒲扇……它的形状也不一，有圆形、方形和多边形，它的颜色有各种各样的——红、蓝、黑、白、花。这些扇子也很受人们欢迎。人们去旅游走路带着它很方便，但是风力很小只能一人使用。
In the hot summer, ancient people only hid under the shade of trees or replaced the fans with leaves. Later, with the development of human beings and the summary of experience, they made all kinds of fans, including bamboo fans, wheat fans, folding fans, and Pu fans It has different shapes, including circles, squares and polygons. Its colors are various - red, blue, black, white and flowers. These fans are also very popular. It is very convenient for people to travel and walk with it, but the wind is very small and only one person can use it.
现在，随着科学的发展，人们发明了风扇，——有台扇，吊扇、落地扇、壁扇。比那些扇子好千万倍，但是还有点热。
Now, with the development of science, people have invented fans, including table fans, ceiling fans, floor fans and wall fans. It's ten million times better than those fans, but it's still a little hot.
后来发明了空调，空调在房子里只要你打开开关，空调就开始制冷，我们就能舒服的休息。因为空调能制冷，又能制热，因此房间有了空调，冷天不冷，热天不热，有了空调不要为炎热、寒冷烦恼了。
Later, the air conditioner was invented. As long as you turn on the switch in the house, the air conditioner will start to cool, and we can have a comfortable rest. Because air conditioning can cool and make heat, so the room has air conditioning, cold days are not cold, hot days are not hot, with air conditioning do not worry about hot and cold.