For more than 500 years the book has been a remarkably stable entity: a coherent string of connected words, printed on paper and bound between covers.
500多年来，书一直是相当稳定的物体：由具有条理的字符串连而成，被印在纸上，有封面和封底。
Internally, the newline character is ignored when creating the string, as is shown when the string is printed.
从内部机制看，在创建字符串时换行符会被忽略，在打印字符串时可以看出这一点。
Whatever string is returned by that function is then printed to the screen.
由此函数返回的任何字符串都会被打印到屏幕。
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