这种方法有很多问题：文件格式是任意的，只保存一个关键字集合，根本没有对象、数据值限制到一行文本等等。
This approach has many problems: the file format is arbitrary, only one set of keywords is saved, objects are not even on the horizon, data values are limited to one line of text, and so on.
循环缓冲区是一种用于应用程序的日志记录技术，它可以将相关的数据保存在内存中，而不是每次都将其写入到磁盘上的文件中。
A ring buffer is a logging technique for applications whereby the relevant data to be logged is kept in memory instead of writing it to a file on a disk every time.
当你删除存储在计算机上的文件时，这些数据并没有真正移除，它们的信息被保存在操作系统可以查询到的目录中。
When it comes to data stored on your computer, deleting files doesn't actually remove the data.
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