就某种意义而言，每一行的类型由它的第一个字符确定(可能是分号、左花括号或字母)。
In one sense, the type of each line is determined by its first character (either semicolon, left brace, or alphabetic).
“我们正在读一本书的第一章第一行，这本书的页数是无限的……”我不知道是谁写的，可我很喜欢这句话，它提醒我们未来是由自己创造的。
I do not know who wrote those words, but I have always liked them as a 3 reminder that the future can be anything we want to make it.
首先第一行创建了类Document的一个实例，它由一个或者多个的域(Field)组成。
The first line creates an instance of the Document class, which consists of a collection of fields.
三行体：一种由三行组成一节的一种意大利诗，诗中每前一节的中间一行和后一节的第一行和第三行押韵。
Terza rima: an Italian verse form consisting of a series of three-line stanzas in which the middle line of each stanza rhymes with the first and third lines of the following stanza.
输入由多个案例组成。第一行就一个整数表示测试案例的个数。
Input consists of several test cases. The first line of the input file contains a single integer indicating the number of test cases.
输入由多个案例组成。第一行就一个整数表示测试案例的个数。
Input consists of several test cases. The first line of the input file contains a single integer indicating the number of test cases.
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