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.

youdao

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.

youdao

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.

youdao

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.

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

耶鲁公开课 - 金融市场课程节选

Remember, you've got to keep track of the sign of acceleration, so if you're picking up speed towards the ground, a is negative, so it will be g plus a, but a is a negative number.

记住,一定要注意加速度的符号,所以当你加速下降的时候,a 是负的,还是 g 加上 a,但是 a 是负数

耶鲁公开课 - 基础物理课程节选