要开始测试，请切换到机器上的任意随机目录。
这是一个过滤器，它将XY Z替代成小于611(该数字是任意选择的)的随机数。
This is a filter that replaces XYZ with a random number less than 611 (that number is arbitrarily chosen).
医学研究的黄金准则，随机试验的方法，不但没有准头，且也是不可能的：准妈妈们不可能接受研究人员的对她在哪里分娩给出的任意指令。
Randomised trials, which are the gold standard in medical research, will be tricky to impossible: women are unlikely to accept a researcher's arbitrary instruction about where they should give birth.
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