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1 three reasons why you should be optimistic ÄãÓ¦¸Ã±£³ÖÀÖ¹ÛµÄÈý´óÀíÓÉ 2 i want the nation to learn from worcester tech ÎÒÏ£ÍûÈ«¹úÈËÃñ¶¼ÒªÏòÎé˹Ìؼ¼Ð£Ñ§Ï° 3 set the world aflame ÈÃÊÀ½çȼÉÕÆðÀ´°É 4 a persistent curiosity can help us reach ambitious goals Ê¼ÖÕÈçÒ»µÄºÃÆæÐÄ¿ÉÒÔ°ïÖúÎÒÃÇʵÏÖºêΰĿ±ê 5 what we have in common is more important than our interesting differences ÎÒÃǵĹ²Í¬µã±ÈÄÇЩÓÐȤµÄ²îÒì¸üÖØÒª 6 there ain't no such thing as impossible Ã»ÓÐʲôÊDz»¿ÉÄܵĠ7 spread light and liberty wherever you go °Ñ¹âÃ÷ºÍ×ÔÓÉ´øµ½Ã¿Ò»¸öµØ·½ 8 how we have to prepare to be citizens of a free society ÎÒÃÇÈçºÎ×öºÃ×¼±¸³ÉΪһ¸ö×ÔÓÉÉç»áÀïµÄ¹«Ãñ 9 why rule of law is important to us ÎªÊ²Ã´·¨ÖζÔÎÒÃǺÜÖØÒª 10 the role you play ÄãÃdzе£µÄ½ÇÉ« 11 i urge you to be fearless about the future ÎҶشÙÄãÃÇÓ¸ÒÎÞηµØÃæ¶ÔδÀ´ 12 what's the happiness ÐÒ¸£ÊÇʲô 13 don't let your country down ²»ÒªÈÃÄãÃǵĹú¼ÒʧÍû 14 you are all diplomats ÄãÃǶ¼ÊÇÍâ½»¹Ù 15 how to live a meaningful life ÈçºÎ¶È¹ýÒ»¸öÓÐÒâÒåµÄÈËÉú 16 law and freedom ·¨ÂÉÓë×ÔÓÉ 17 you are the leaders of tomorrow ÄãÃÇÊÇδÀ´µÄÁìÐä 18 this world was built by optimists ÊÀ½çÊÇÓÉÀÖ¹ÛÖ÷ÒåÕß½¨ÉèµÄ