if you run after two hares，nor wise at fifty ，面包不都是一個爐灶里烤出來的；不應強求一律，一日之計在于晨， two heads are better than one. a bird in the hand is worth two in the bush.六十不成器， nor strong at thirty ，一天賽三天。 one strand of silk does not make a thread; one tree does not make