如果你不挑战自己的极限，试图听懂更多的内容，你就不会进步。
If you are not trying to push your limits in terms of how much you understand, you won't improve.
除非你更加努力，否则你在数学学习上就不会取得进步。
You can't make progress in math learning unless you work harder.
只要你完全满意你就不会有进步。
As long as you're perfectly content you can't make progress.
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