"Four seasons in a year" 的英语表达为 "The four seasons of the year".
这个说法的来源是对一年四个季节的描述。四季分别是春天，夏天，秋天和冬天。它们代表了一年中的不同季节，具有特有的天气，植物生长等特征。
例句：
"The changing of the seasons is one of the most beautiful things about nature." （季节的变换是自然界最美的事物之一。）
"Spring is the season of renewal and growth." （春天是复苏和生长的季节。）
"Summer is the season for outdoor activities and relaxation." （夏天是户外活动和放松的季节。）
"Autumn is a time for harvesting and preparation for the winter." （秋天是收获和为冬天做准备的时期。）
"Winter is the season of snow and cold weather." （冬天是雪和寒冷天气的季节。）