问大家一个英语句子His team found that levels of stress were highest a
问大家一个英语句子
His team found that levels of stress were highest among adults between the ages of twenty-two and twenty-five. Stress levels dropped sharply after people reached their fifties.Happiness was highest among the youngest adults and those in their early seventies. But the people least likely to report feeling negative emotions were those in their seventies and eighties. 为什么FOUND后面的从句是结论性的话语 用的是过去时?