旧规则必须修改，因为它们只适用于一百年前的情况。
The old rules have to be revised because they only applied to the circumstances that existed a hundred years ago.
旧的规则必须修改，因为它们只适用于一百年前制定规则时存在的情况。
The old rules have to be revised because they only applied to the circumstances that existed when they were made a hundred years ago.
通常，一百个样本要花费实验技术员超过两天的时间来检测，但是一只老鼠只需要花费不到二十分钟。
Traditionally, a hundred samples would take lab technicians more than two days to examine, but for a rat it takes less than 20 minutes.
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