Unit  11
Language Points
1. part of  vs.  a part of
part of　指某人或谋事物是一个整体不可分割一部分，即强调整体性．  There is but one China and Taiwan is part  of China.  we are all part of one big family. a part of　不强调整体性，只说明是组成整体一小部分或一部分．  A leg is a part of a body. This books look like a part of the broken glass.
２．on the radio=over the radio=by radio
     I heard the news on the radio.
3. musical adj. 　(1)of or for music 音乐（定）；  musical instrument,   musical talent,                a musical film,       a musical socie ...