它告诉我们这样的道理：做得过分和做得不够都是不对的。
It tells us going too far is as bad as not going far enough.
它告诉我们这样的道理：不注重客观事实，做了多余的事情，反而不好。
That's the story of "Draw a snake and add feet to it." it tells us going too far is as bad as not going far enough.
这告诉我们一个重要的事实：interval是不管当前在执行些什么的，在任何情况下它都会进入到队列中去，即使这样意味着每次回调之间的时间就不准确了。
This shows us an important fact: Intervals don't care about what is currently executing, they will queue indiscriminately, even if it means that the time between callbacks will be sacrificed.
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