n. 恢復,復原,痊愈
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Stock prices took a roller-coaster ride this week -- down one day, up the next. Experts say the situation is likely to continue until investors feel more sure about signs of economic recovery.
Some investors worry that Americans are not doing enough to lift the world's largest economy out of recession. This is back-to-school season. But the National Retail Federation says school-related sales are down from last year.

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