许多老年人习惯于晨练,但是每天来个“黄昏练”也许效果会更好。因为植物白天释放氧气,夜晚释放二氧化碳,傍晚大气中的氧气达到最大量,对锻炼身体很有好处,相反,早上的二氧化碳浓度最高,锻炼身体相当于吸入大量废气。 Many older people are accustomed to morning exercises, but getting a Dusk Practice every day may be better. Because plants release oxygen during the day and release carbon dioxide at night, atmospheric oxygen reaches the maximum amount in the evening, which is good for exercising. In contrast, the highest concentration of carbon dioxide in the morning and the exercise is equivalent to inhaling a large amount of exhaust gas.