Child psychiatrists have long known that sometimes O. C. D. in children can be like that, that it can come on fast, out of the blue, like a plague, and then last anywhere from days to months.

儿童精神科医生们早就知道，有时儿童的强迫症可以突然发病，像瘟疫一样，然后症状可以持续从几天到几个月或者更长。

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It will last at least a few days, sometimes longer.

可以保留几天或者更长的时间。

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Lettuce is best when served fresh. Store the remainder in the refrigerator in a plastic bag. It will last a few days and sometimes longer.

新鲜食品中生菜最佳蔬菜，多余的贮存在冰箱里时应装在塑料袋中，可以多存一半天及至几天。

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The calls, often to expensive destinations in poor countries, sometimes last days, Mr Crooks says, because cheats use forwarding systems to serve many customers with a single call.

ECONOMIST: Computing