《Programming Abstractions In C》学习第54天，p138，总结如下：
一、技术总结
1.stdio.h
3.4小节介绍“The standard I/O library”，涉及I/O操作最常用的接口是stdio.h，我们经常用到里面的printf函数。
2.永久性数据以文件的形式进行存储
p138。
3.text file
p138, When you use a file to store data for use by a program, that file usually consist of text and is therefore called a text file。You can think of a text file as a sequence of characters stored in a permanent medium and identified by a file name。
二、英语总结
1.mostly什么意思？
答：p132，“Every program in the text includes this interface, mostly because it exports the print function”。mostly的意思是“adv. mainly(主要是)”。
2.persist什么意思？
答：vi. continue to exist。
3.cohesive什么意思？
答：adj. as in coherent(连贯的)。
4.floppy disk是什么？
答：floppy的意思是“adj. soft and not easy to keep a firm shape(松软的)”，所以floppy disk指的是“软盘”。
三、参考资料
1. 编程
(1)Eric S.Roberts，《Programming Abstractions in C》：https://book.douban.com/subject/2003414
2. 英语
(1)Etymology Dictionary：https://www.etymonline.com
(2) Cambridage Dictionary：https://dictionary.cambridge.org
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