The GraphicsEnvironment class holds the graphics object and a set of colors. It also contains the width and height.

graphicsenvironment类中保存了图形对象和一组颜色，还包括宽度和高度。

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Here every Rectangle object created will have three properties - height, width and area.

在这里矩形对象中会有会个属性，height, width和area。

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In Listing 3, menubar, title, height, width, content, and visible are all attributes of the Frame object.

在清单3中，menubar、title、height、width、content和visible都是Frame对象的属性。

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So，the point is,every object falling under gravity is given by the same formula, but there are many, many objects that can have many histories, all falling under gravity, and what's different from one object and the other object is, when was it dropped, from what height, and with what initial speed.

关键是,每一个受重力作用下落的物体,都有同样的表达式,但是各个受重力作用下落的物体,都有不同的初始条件,所以它们的区别在于,下落时刻,下落高度和初始速度

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