检查，如果文件指针达到EOF没有文件指针移动？
Checking if the file pointer has reached EOF without moving the file pointer?
录制过程中，只要你移动鼠标，录制窗口就会跟着指针移动。
The recording window automatically moves along with the pointer whenever you move the mouse during recording.
把鼠标指针移动到饼图的每个部分上，就会看到这种语句类型的百分比。
Move the pointer over each section of the pie chart to view the percentage for the statement type.
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