12 Bicycle Metals

Bicycle Metals by ELLEN B. CUTLER

自行车金属艾伦B。 卡特勒

Chapter 1 What Are Metals? Metals are a solid. A solid has a shape of its own. Most solids do not bend. They break. Yet metals are different from most solids. Metals can bend. We can also change the shape of metal. We do this by making the metal very hot. Very hot metal turns into liquid. Liquid metal can be made into different shapes.

第一章金属是什么? 金属是固体。固体有自己的形状。 大多数固体都不弯曲。他们打破。 然而金属不同于大多数固体。 金属可以弯曲。我们还可以改变金属的形状。 我们通过使金属非常热来做到这一点。 很热的金属变成液体。 液态金属可以被制成不同的形状。

Chapter 2 Strong and Light There are many strong metals. Some of them are heavy. Some of them are light. What kind of metal would you use to make a bicycle? You would want a strong, light metal. Strong metals keep a bicycle from breaking or bending. Light metals make a bicycle easier to ride. They make it easier to lift, too.

有许多坚硬的金属。 有些很重。有些很轻。 你会用什么金属做一辆自行车? 你会想要一种坚固的轻金属。 坚固的金属使自行车不致折断或弯曲。 轻金属使自行车更容易骑。 它们也使它更容易举起来。

Chapter 3 Changing What a Metal Can Do Most of the metals we use are metal mixtures. Some mixtures are made of two or more metals. Other mixtures are made of metal and other materials. All these mixtures are melted together. A mixture made from heavy materials can be light! A mixture made from soft materials can be strong!

我们使用的大多数金属都是金属混合物。 有些混合物由两种或两种以上的金属构成。 其他混合物由金属和其他材料制成。 所有这些混合物都融化在一起。 由重材料制成的混合物可以很轻!由软质材料制成的混合物可以很结实!

Chapter 4 Aluminum and Aluminum Mixtures We use metals and metal mixtures every day. One kind of metal is aluminum (uh-LEW-muh-nuhm). Aluminum foil is a thin sheet of metal. It bends easily. People use aluminum foil for cooking and wrapping food. Aluminum mixtures are used to make buildings and bridges. They are also used to make bicycles.

第四章铝和铝混合物我们每天都在使用金属和金属混合物。 一种金属是铝(uh-LEW-muh-nuhm)。 铝箔是一种薄金属片。 它很容易弯曲。人们用铝箔来烹饪和包装食物。 铝混合物被用来建造建筑物和桥梁。 它们也被用来制造自行车。