和随机数生成程序、当前日期/时间函数一样，UDR 通常是变化的，因此不能用于函数索引。
UDRs, like random number generators and current date/time functions, are variant and therefore cannot be used.
我们没有建立复杂的测试应用程序，该页面在每次单击链接时仅仅生成随机数。
Rather than building some sophisticated application for testing, this page will simply generate random Numbers every time a link is clicked.
uuid是一个惟一的随机数，是由uuidgen实用程序使用网络地址信息和系统时间生成的。
Uuid is a unique random number that gets generated with uuidgen utility which USES network address information and system time.
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