昨天入伏，我却忘了吃饺子；转眼到了明日大暑——作为夏季最后一个节气，也意味着真正炎热潮湿的天气已经来临。此时，防暑降温、清淡饮食、规律作息便成了生活的关键词，而日子也悄然迈入了下半年。

On March 21, the lunar calendar is a spring equinox, and in a second, we have the fourth solar term of the twenty-four solar terms.So how much do you know about the vernal equinox? What is the meaning