The pace is up to you, you can go through the easier parts faster and then take more time to study the more sophisticated ones.

速度取决于你，你可以更快地通过更容易的零件，然后花更多的时间来研究更复杂的。

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Difference can take on a vary wide spectrum such as race, gender, ones social status in society which plays an important part in the class rooms because everyone does not learn at the same pace.

差别可以出现在很多不同的领域，比如种族，性别，个人的社会地位。社会地位在教室里起很大作用，因为每个人会因此导致学习的快慢不一样。

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