或者你想储存一个负数，就必须位于负20亿到，正20亿之间，是个有限的范围。
Or if you want negative Numbers, between negative 2 billion and positive 2 billion, but it's a finite range.
如果这当中有一个负数，乘积就会变成负的，如果你对一个负数开根号，你就会得到一个虚数。
If you had one negative number in it, then the product would be a negative number and, if you took a root of that, then you might get an imaginary number.
我们主要到在r圈时E的值为负，和它本来的值一致，是一个负数。
We notice that the value of E at r naught is negative, as it should be. It's a negative number.
负能量平衡：如果你得到一个负数，你会发现减肥所需的能量是不平衡的。
Negative energy balance: If you end up with a negative number, you've found the energy imbalance necessary for weight loss.
第一个基准条件用来处理非整数；第二个用来处理负整数。在小数或者负数做参数的时候，函数就会输出错误信息，返回空到调用出来表明出错了。
The first base case handles nonintegers; the second handles negative integers. In both cases, the program prints an error message and returns None to indicate that something went wrong.
第一个基准条件用来处理非整数；第二个用来处理负整数。在小数或者负数做参数的时候，函数就会输出错误信息，返回空到调用出来表明出错了。
The first base case handles nonintegers; the second handles negative integers. In both cases, the program prints an error message and returns None to indicate that something went wrong.
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