求翻译：As with anything carried to excess, daydreaming can be harmful. There are always those who would substitute fantasy lives for the rewards of real activity. But such extremes are relatively race, and there is a growing body of evidence to support the fact that most people suffer from a lack of daydreaming rather than an excess of it. We are now beginning to learn how valuable it really is and that when individuals are completely prevented form daydreaming, their emotional balance can be disturbed. Not only are they less able to deal with the pressures of day-to-day existence, but also their self-control and self-direction become endangered是什么意思？

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