39.持之以恒persevere

　　40.家喻户晓widely known,known to all

　　41.默默无闻unknown to the public

　　42.树立榜样set a good example for

　　43.理所当然naturally，of course

　　44.数以万计tens of thousands of

　　45.世世代代from generation to generation

　　46.心不在焉absent-minded

　　47.梦想成真come true，become a reality

　　48.迫在眉睫extremely urgent

　　49.刻不容缓be of great urgency

　　50.无时无刻all the time

　　51.无所事事have nothing to do

　　52.毫不犹豫without hesitation