高考英语必背3500单词 turn against sb/sth 背叛turn back返回 turn down调低，拒绝turn up 开大，上涨，到来，露面 turn in 上交(=hand in) turn to 转向，变成，求助于 turn off 关掉 turn on 打开turn over 翻过来 turn A into/to B 把A变成Bturn out (to be) n/adj/ adv 结果是，被证明是(强调与预料的相反)eg. He turned out to be very
