随时间变化的数据的一个好例子就是代码列表。
A good example of data that changes over time is code lists.
好，既然我们已经知道点的位置，它是一个关于时间的函数，我们就能了解，它在诸如速率或加速度的量中是如何变化的。
OK, so, now that we know the position of the point as a function of time, we can try to study how it varies in particular things like the speed and acceleration.
如果架构需要根据变化不断作出调整，那么这不是一个好的标志。
If the architecture needs to be continually revised due to relatively minor changes, then this is not a good sign.
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