that this equation has this particular form.

它来源于这个方程的特定形式
If you tamper with this, if you add to this a little bit,

如果你想破坏这一切的话如果加上这一项
like 1 over 100 times x^3, then all these bets are off.

像是 1 除以 100 乘以 x^3 那么这些全完了
It's got to be that equation for that result to be true.

结论要成立的话方程一定是那样的
Okay. So, this is simple harmonic motion.

这就是简谐运动
Then, you can do the following variant of this solution,

接下来我们可以对这个解做一些变形
which I will write down now.

我现在把它写下来
Suppose I set my clock to 0, right there.

假设我把这里作为计时起点
You set your clock to 0 here, but I can say,

你可以把计时起点选在这里但我想
"You know what? I just got up

我恰好在这时看到了这个物体
and I'm looking at the mass, I set my clock to 0"

我一定想把这时作为计时起点
When it hits 0, it's not at the maximum.

此时它没有位于最大位移处