检查核对本来应该是件简单的事情。
你必须仔细检查并多方核对你所听到的每一件事。
You have to scrupulously check and cross-check everything you hear.
您可以走到每台机器前手工检查核对所有这些问题，但是当机器分散在一个广阔的区域内，这样做会是一个非常费时的过程。
You could go to each machine and manually check all of these issues, but when the machines are dispersed over a wide area, this can be a very time-consuming process.
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