Originally, the purpose of this header was to identify the intent of the request — the operation to be invoked on the back end.
最初,这个头主要是用来识别请求意图——后台所调用的操作。
At the end of the header cells, you call the Ln method to move down to the start of the next line.
在标题单元格的最后,您要调用Ln方法以便向下移动到下一行的开始。
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