Xi Jinping used this chengyu during a Politburo Standing Committee of the CPC Central Committee meeting on May 14th, 2020.
Meaning
Learn by analogy; infer other things from one fact; draw inferences about other cases from one instance
Original
“各地要认真汲取近期发生聚集性疫情地区的教训,举一反三,对本地防控漏洞再排查、对防控重点再加固、对防控要求再落实,确保疫情不出现反弹.”