正在跳转至 https://books.google.com.hk/books?id=dU--JuYudxgC&pg=PA18&lpg=PA18&dq=uml%E8%AF%A6%E8%A7%A3&source=bl&ots=ay5tHhDK0l&sig=_Fj_cEmG9ZSN5S3HHl1SrNcmcKw&hl=zh-CN&sa=X&ved=0ahUKEwiR14Kg45LVAhXL44MKHRZHD3Y4ChDoAQg3MAQ#v=onepage&q=uml%E8%AF%A6%E8%A7%A3&f=false