by Jordan Sanchez ä¹ãç©ã®æ´å²ã«ããã¦ç¾ä»£ã®èªè»¢è»ã¯1800年代å¾åãè¸æ°èªåè»ã®çºæå¾ã«çã¾ãã¾ããããèªåè»ã«æ¯ã¹ã¦åç´ãªä»çµã¿ã®èªè»¢è»ã¯ããã£ã¨æ©ãææã«çã¾ãã¦ãã¦ãããã£ãã®ã§ã¯ï¼ãã¨ããçåã«ã¤ãã¦ã¨ã³ã¸ãã¢ã®Jason Crawfordãããèå¯ãã¦ãã¾ãã Why did we wait so long for the bicycle? https://rootsofprogress.org/why-did-we-wait-so-long-for-the-bicycle Crawfordããã¯ä¸è¨ã®çåãTwitterã«ã¤ã¶ãããã¨ãããå¨å²ã®äººã ãããã¾ãã¾ãªä»®èª¬ãåãåããã¨ã«ãªãã¾ããã Why wasn't the bicycle invented until like the late 1800s?â Jason Crawford (@jason
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