< span > "time and trees together become tree rings, which truly record the changes of nature and times. Each ring has its own story." This article is from wechat public account: < / span > < a=“ https://mp.weixin.qq.com/s/si1llb2eRDTjOsJdYbdcCw " target="_ Blank "style =" text decoration: none; "> < span > Gezhi Lun Dao class (ID: selftalks) < / span > < / a > < span >, written by Zhang Qibing (researcher of Institute of Botany, Chinese Academy of Sciences), head drawing: visual China < / span >