Understanding the Science of Lactic Acid and Muscle Fatigue You know that feeling – the intense burn in your muscles when you’re doing a super intense workout Your muscles feel like they’re on fire, Plus, you feel that old familiar sense of muscle fatigue But have you ever wondered what causes your muscles to burn and feel tired, and why your muscles scream in protest when you work out at a high intensity? Lactic acid often gets the blame, but
为什么英语中“state-of-the-art”表示“最先进”的意思呢？ - 知乎 附上一则解释，有兴趣的学习一下。 The origin of the concept of "state of the art" took place in the beginning of the twentieth century The earliest use of the term "state of the art" documented by the Oxford English Dictionary dates back to 1910, from an engineering manual by Henry Harrison Suplee (1856-post 1943), an engineering graduate (University of Pennsylvania, 1876