重点讲解：
1. used to do sth. 过去常常；过去曾；
People used to think the earth was flat.
人们曾经认为地球是平的n.;-6QG14#9jsV。
2. take over (武力)占领，接管，控制；
They concluded to take over the airport.
他们决定接管机场S@|,iZ(q-LNHj5!Ts~。
3. refuse to do sth. 拒绝；回绝；
He refused to comment after the trial.
庭审之后他拒绝作出评论m&n#*rN|L=RqNznMS。
4. recognize as 正式认可；承认；正式接受；赞成；
Most doctors appear to recognize homeopathy as a legitimate form of medicine.
大多数医生似乎都接受顺势疗法是一种合理的医疗手段A,|3MElQl=。