这隐藏到了一个函数中,因为它不是直接的映射。
This is hidden into a function because it's not a straightforward mapping.
为了处理长函数,我们通过垂直省略,缺省隐藏较大的语句块。
To handle long functions, we collapse large blocks by default, using vertical elision.
每个函数都相当小,但是它们隐藏了大量烦人的细节。
Each function is relatively small, but all together, the functions serve to hide a lot of annoying details.
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