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一个函数哪怕无限延申，也会不忘初心牢记使命…………
math textbook: the limit of a function reminds us of Chairman Xi's teaching that we should "never forget our original intention & ultimate mission"
biology textbook: every species has its own genes, just as Communist Party members have "red genes," without which China is doomed
🐦🔗: https://twitter.com/dikaioslin/status/1519541333094170624
