举个例子，我在写这篇文章的过程中，不得不把车送去维修，进行两次计划外的出行，其间一个家人病了等等，诸如此类。
When I was writing this piece, for instance, I had to take my car into the shop, I had to take two unanticipated trips, a family member fell ill, and so on.
它可以非常昂贵关闭线的维修和保养，但它可能是灾难性的，如果是计划外的停机。
It can be very expensive to shut down a line for repairs and maintenance, but it might be catastrophic if the shutdown is unplanned.
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