Mechanistic and biomarker work echoes the U‑shape, with deviations below seven or above eight to nine hours linked to markers of biological aging, though causality can be confounded by illness extending time in bed.
他主張，儘管中國經濟實力雄厚，但尚不是與美國「同級的超級強國」；「即便願意，中國也沒有能力保護其朋友免於這類行動。」
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A long lost painting by Rembrandt has been rediscovered and authenticated by experts, after its whereabouts were unknown for decades.