我们只在第一次调用fact的时候需要它，也就是在factorial的最后。
We only use it the first time we call fact, at the end of factorial.
注意，路径必须是一个闭环—也就是说，路径中第一个Edge对象的第一个点必须与最后一个Edge对象的最后一个点的位置相同。
Note that the path must be a closed loop - that is, the first point of the first Edge object in the path must have the same location as the last point of the last Edge object.
也就是说这是你们生命最后一天的第一天…不，这样说不对。
That means this is the first day of the last day of your life... No, that's wrong.
我还想告诉大家，今天这些内容结束的地方，这个最后的主题，也就是第一次考试，要考到的地方。
I also want to note that the end of the material today, so this last topic here, that's the end of the material that's going to be on this first exam.
一个晴朗的六月天的早晨，第一个要我照应的漂亮小婴孩，也就是古老的恩萧家族的最后一个，诞生了。
On the morning of a fine June day, my first Bonny little nursling, and the last of the ancient Earnshaw stock, was born.
也就是说第一个房屋和最后一个房屋相邻。
意思是在英国，第一个是指你的名，最后一个是你的姓。也就是名字在前面，姓氏在后面。
In England, the fist name is (given) name, and the last name is the (family) name.
意思是在英国，第一个是指你的名，最后一个是你的姓。也就是名字在前面，姓氏在后面。
In England, the fist name is (given) name, and the last name is the (family) name.
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