"We can't only listen once. We've got to listen twice because sometimes when the stories are told, you hear something and you learn something.
VOA: standard.2010.02.19
If you don't do that, there's a danger you will learn something you don't have to, and we don't want that.
但是如果你不来,你就有可能学到一些不重要的知识,我们当然不希望这样
We go back to the spring and we want to learn something about the spring.
我们回到弹簧的问题上来,我们要学习一些关于弹簧的知识
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