If you'd prefer to learn the language more slowly or you don't have the ability to move to a new country and practice 4-8 hours a day, then you can modify the plan.

如果你想要慢点学或者你没法搬去另一个国家，或者你不能保证每天学习4 - 8小时，你也可以调整计划。

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As people age, they work a lot less, they move more slowly, they don't need as many mitochondria.

人随着年龄增长，工作减少很多，活动更为缓慢，不再需要同样多的线粒体。

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