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    Randomize 语句
初始化随机数生成器。如果不使用 Randomize，则第一次调用 Rndom 函数时，它将使用相同的数字作为种子值，随后使用最后生成的数值作为种子值。建议每次取随机值的时候，先用Randomize，再用random，因为Randomize是起初始化作用的。如果只用random，比如：随机取100次，你就会发现有很多都在一个比较接近的范围，使得随机行显得稍差！

Randomize procedure
 Initializes the random number generator with a random value.

Description

Randomize initializes the built-in random number generator with a random value (obtained from the system clock). The random number generator should be initialized by making a call to Randomize, or by assigning a value to RandSeed.

Do not combine the call to Randomize in a loop with calls to the Random function. Typically, Randomize is called only once, before all calls to Random.