Before I can get to the mapping part of the solution, you need to understand how a simple three-letter string like DEN gets converted to a point on a map.
在讨论该解决方案的地图绘制部分之前，您需要了解如何将一个简单的三个字母的字符串(如den)转换为地图上的一点。
You’re only three years old, and at this point in your life you can't read, much less understand what I’m going to try to tell you in this letter.
你现在仅仅3岁，此刻你还不识字，更不用说让你去理解我接下来想在这封信里对你所说的话了。
You're only three years old, and at this point in your life you can9t read, much less understand what I'm going to try to tell you in this letter.
你现在仅仅3岁，此刻你还不识字，更不用说让你去理解我接下来想在这封信里对你所说的话了。
You're only three years old, _and_at this point in your life you can't read, much less understand what I'm going to try to tell you in this letter.
你现在仅仅3岁，此刻你还不识字，更不用说让你去理解我接下来想在这封信里对你所说的话了。
You're only three years old, and at this point in your you can't read, much less understand what I'm going to try to tell you in this letter.
你现在仅仅3岁，此刻你还不识字，更不用说让你去理解我接下来想在这封信里对你所说的话了。
You're only three years old, and at this point in your you can't read, much less understand what I'm going to try to tell you in this letter.
你现在仅仅3岁，此刻你还不识字，更不用说让你去理解我接下来想在这封信里对你所说的话了。
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