Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient ...

组成人体骨骼肌的肌纤维主要分为快速抽动肌纤维、慢速抽动肌纤维两种。前者更多参与如短跑、举重等需要爆发力、高效耗能的行为，后者则主要在马拉松等需要耐力的运动中发挥作用 [7]。

See? “By” originally means “bye” or byway. That’s why, in fact, some people still spell “by the by” as “by the bye”. By the ...