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They used manual techniques , such as double-book accounting , to ensure that errors were detected and resolved before they could materially affect the business .
他们利用人工技术，如双份的会计账目，用以确保在错误实质上影响到业务之前检测并分辨出它们。
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When everything in your life is on one calendar , in one planner , you can 't double-book anything . You know , like an important test and a dinner with your boss .
如果你生活中所有的事都记在一个日历上，在一个计划中，你就不能重复安排任何事了，就像一个重要的测试或者和老板的晚餐一样。