Once you have learned the theory and practical skills, you will treat museum artifacts from local, regional, and national sites.
这也是一个安全的城市:一旦你学会了如何骑自行车,很容易得到解决。
It's also a safe city: once you have learned how to ride a bike, it's easy to get around.
这也是一个安全的城市:一旦你学会了如何骑自行车,这是很容易的。
It's also a safe city: if you learn how to ride a bike, it's easy to get around.
尽管一旦你学会了用数学的方式思考,你会比单纯地遵照程序化的方法去做时更容易得到正确答案。
(Though once you have learned how to think mathematically, getting the right answer becomes a lot easier than when you were just following procedural recipes.).
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