string(250) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%95%86%E6%A0%87%E7%9A%84tm%E4%B8%8Er%E7%9A%84%E5%8C%BA%E5%88%AB%E5%9C%A8%E5%93%AA => Failed to connect to 14.116.215.7 port 38225: Connection refused"
商标的tm与r的区别在哪
