本节中的主题将示范如何沿著路径建立物件的动画。
The topics in this section demonstrate how to animate an object along a path.
群组物件的方式有二：建立物件的阵列和建立物件的集合。
There are two ways to group objects: by creating arrays of objects, and by creating collections of objects.
这个方法是静态的，而且不需建立物件的执行个体就可以叫用。
This method is static and can be invoked without creating an instance of the object.
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