你们可以，参考教材，来了解这些单位的定义和历史。
Now, you can read in your book how these are defined and how the definition evolved historically.
这是概率论教材，希望对大家有很大的参考价值！
This is the teaching of probability theory, I hope all of you have great reference value!
虽然本课程没有教材，但提供了参考资料来补充课堂讲稿。
Although no textbook was used during the course, references were provided to supplement the lecture notes.
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