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。
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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