cat的- a选项提供了另一种方法来查看制表符和行结束符的位置。
The -a option of cat provides an alternate way of seeing where your tabs and line endings are.
在此之后，如果在一行的开头输入空格或制表符，那么后续的新行将会缩进到相同的位置。
From this point on, if you use leading spaces or tabs in a line, subsequent new lines will be indented to the same place.
人们认为这种表的优势在于：任何人只要有这样一块十进制表，再能看到地平线以上太阳的高度，就会立刻知道他在地球上的位置。
The supposed advantage was that any observer with a decimal chronometer and a view of the sun’s height above the horizon would then know instantly where on the planet he was.
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