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The Wheel
輪子
You probably see wheels underneath cars, airplanes, bikes and many other vehicles.
你可能看到過汽車、飛機、自行車和很多其他交通工具底下的輪子。
A wheel is a kind of machine.
輪子是一種機器。
It is round, it moves along the ground.
它是圓形的，能沿著地面滾動。
It helps people to move heavy things, also it helps people to travel faster.
它能幫助人們運送笨重的東西，也能使人們的旅行更快捷。
Do you know when the first wheel was made?
你知道第一個輪子是什么時候制造出來的嗎？
It was made around B.C.3500.
它大約是在公元前3500年制造的。
At that time, it was made of wood.
那時，它是由木頭制成的。
