时钟计数函数返回你的操作系统的内部时钟的值，并且是以毫秒的形式；它通常被用于计算总共用时，入在接下来的练习中(见图6.54)。
Tick Count (ms) returns the value of your operating system's internal clock in milliseconds; it is commonly used to calculate elapsed time, as in the next activity (see Figure 6.54).
资源共享是操作系统程序和多个用户程序共用系统中的资源。
The sharing of resources is the operating system procedures and procedures for multiple users to share system resources.
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