A pointer helps with control because instead of just using your eyes, you can physically move your hand to adjust your reading speed.
阅读时使用指针可以帮你很好地控制速度。
You Can define the excessive speed of a motor-car in terms of a pointer reading on a speedometer. But Can you define excessive noise in the same way?
你可以根据一个速度表上指针的读数来定义一辆机动车的超速，但是你可以用这种方法来定义噪音超标吗？
Open for reading and writing; place the file pointer at the end of the file.
打开阅读和写作，在文件结尾处的文件指针。
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