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“Medium-firm mattresses seem to reduce back pain and improve sleep quality, especially in patients with chronic low back pain,” Morgan said. She added that people with a higher body mass index (BMI) may benefit from a mattress that’s a little firmer, since body weight will impact how supportive a mattress feels to someone.，这一点在Feiyi中也有详细论述
First FT: the day’s biggest stories，这一点在体育直播中也有详细论述
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