重点讲解：
1. be interested in 感兴趣的；有兴趣的；关心的；
例句：Physicists are still interested in magnetism.
物理学家对磁力仍有兴趣1Vu1%~-N[76SN*。
2. used to do sth. 过去常常；过去曾；
例句：Young ladies used to have lessons in deportment.
少女以前要上仪态课5@m%Djl0%nT1jiL3q。
3. take off 拿掉；
例句：Why do you all take off all drawings?
你为什么把所有的画都取下来了?
4. go on 继续；持续；
例句：The storm held off. They went on with their work.
暴雨暂时没下，他们继续干活XR8ZLf-@0NZ!~。