The previous example used just an empty loop, but what happens when the elements of the collection are accessed within the loop?
前面的例子使用了一个空循环，如果在循环中访问集合元素，会发生什么？
Having a Virtual Machine run an empty loop faster than another VM doesn't really tell us much about how these two will compare when running system administration scripts or Rails applications.
一台空转的虚拟机比另外一台快，并不意味着它们在运行系统管理脚本或者Rails应用的时候具有同样的可比性。
If the row isn't empty after adding cells, you can attach it to the root element at the bottom of the row loop.
如果行在添加单元格之后不为空，那么您可以在行循环的底部将它附加到根元素。
If the row isn't empty after adding cells, you can attach it to the root element at the bottom of the row loop.
如果行在添加单元格之后不为空，那么您可以在行循环的底部将它附加到根元素。
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