you'll be relieved that that's behind us now.

你可以长舒一口气了因为相对论已经学完了
And let me remind you one more time

我再提醒你们一次
that the problem set for relativity was quite challenging,

相对论的习题集非常有难度
because I had to make up most of the problems.

因为大部分题目都是我出的
And they're not from the book, so they're a little more difficult.

这些题目不是课本上的所以要难一点
The exam will be much more lenient compared to the homework.

考试会比作业更简单一些
That's generally true, but particularly true in this case.

一般课程都是这样我们这门课更是如此
Okay. So, today I'm going to introduce you to some mathematical tricks.

今天我要向你们介绍一些数学技巧
As you've probably noticed by now,

可能你们已经注意到了
a lot of physics has to do with mathematics,

许多物理都跟数学有关
and if you're not good in one,

如果其中有一个你不擅长的话
you're not going to be good in the other.

另一个你也不会擅长