Sprite and FlexSprite are the base classes that don't require a timeline, and you can extend these to write your own custom classes.
Sprite和FlexSprite是不需要时间线的基类,您可以通过扩展它们编写定制类。
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"If you have moved house, you know how much time is wasted constructing the base of the box before you can put anything in it, and it's even worse on a factory assembly line," he says.