So, what's the change in x here?
那么x在此处的变化又是什么呢？
How does it change because of x?
它怎么随着x发生变化呢？
x So, the difficulty there is we can change x, or we can change y, or we can change both.
困难在于我们既可以改变，也可以改变y，或者同时改变。
These are the rates of change of x, y, z when we change u.
这些是u变化时，x，y，z的变化率。
There is typical change with rickets in their blood and X ray.
血生化及X线片有典型佝偻病改变。
And we both know hearts can change ( x" d, h% n".
我们都知道心是会改变的。
In the distant future, the X universe faces a period of profound and irrevocable change.
在遥远的将来，X宇宙会迎来一个意义深远的革新。
In the distant future, the X universe faces a period of profound and irrevocable change.
在遥远的将来，X宇宙会迎来一个意义深远的革新。
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