並前往https://books.google.com.tw/books?id=I-WuEAAAQBAJ&pg=PA100&lpg=PA100&dq=focus%E9%9A%94%E9%9F%B3ptt&source=bl&ots=yzaN9JKwb-&sig=ACfU3U0vBXVDiKd_Ih14aJMRVGH1IguDfg&hl=zh-TW&sa=X&ved=2ahUKEwjqt_GSueeAAxWYklYBHQDWDIYQ6AF6BAhuEAM