be made of +(可见原材料）：be made from+(不可见原材料）eg: Glass is made from sand.（玻璃是由沙子制成的（二氧化硅）） 它表示一种种类时,它可以加复数,例如fruit,它表示种类时,表示总称：There are kings of fruits here.
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现在我们来看看另一种陶瓷，它是由沙子和矿物质混合，再加热到600多摄氏度制成的。
We'll now look at another ceramic which is made from mixing sand with minerals and heating to over 600 degrees Celsius.
北立面的一部分以自然石膏为特色，它由当地的泥土和沙子制成，南立面有一个网格结构。
A portion of the northern facade features natural plaster made of local dirt and sand, while the southern elevation has a trellis structure.
光学玻璃是由高纯度原料：沙子、石灰、纯碱制成的。
Optical glass is made of raw materials-sand, lime, and soda of the highest purity.
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