The key to this exercise is mapping the data.
这个练习的关键是映射数据。
Given the existence of the ancestor path, mapping the semantics is pretty simple.
给定祖先路径，该语义的映射很简单。
But mapping the genome is only the first step.
但是绘制基因组只是第一步。
Mapping the Moon is a challenge because its color does not change greatly.
测绘月球称为一项挑战，原因在于它的颜色不会大幅变化。
Mapping the XML type system to the native language type system has two disadvantages.
将XML类型系统映射为原生语言的类型系统有两方面的劣势。
For mapping, the network technology is a double-edged sword.
对于测绘而言，网络技术就是一把双刃剑。
To create the correct mapping, the tool has to know that ACCOUNT_ACCOUNTID is a foreign key.
要创建正确的映射，映射工具必须知道 ACCOUNT_ACCOUNTID 是个外键。
After creating the mapping, the next step is to specify the type of map.
创建映射以后，下一步是指定映射类型。
After creating the mapping, the next step is to specify the type of map.
创建映射以后，下一步是指定映射类型。
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