季节变换 meaning in English

changing seasons

As the seasons change , so do temperature , weather and the length of day
季节变换，气温、天气以及白昼的长度也会随之而改变。
He said sunlight raises the level of melatonin ( the hormone that helps us keep rhythm with the seasons ) in a person ' s cerebral spinal f1uid , which in turn raises a person ' s spirits
阳光会使人体脑脊液里的褪黑激素(能使人跟上季节变换节奏的激素)升高，褪黑激素升高度过来会使人更有精神。
It was a life filled with pure fresh air , lots of exercise , warm family life , mineral rich water , a variety of fresh foods changing with the seasons , sleeping and rising with the sun , and relatively no stress as the average person had to work only one day a week to get enough food
那是一种充满乾净空气、许多锻炼、温暖家庭气氛、富含矿物质的饮水与随季节变换的多种新鲜食物的生活，人们随著太阳而作息，也不会有过多的压力压力因为他们一个星期只需要工作一天就能够得到充足的食物。