关于difficult的精选

yesterdaywillnotbecalledagain.昨日不复来。witonceboughtisworthtwicetaught.由经验而得的智慧，胜于学习而得的智慧；一次亲身的体会，胜过两次的教师教导。tomorrowcomesnever.切莫依赖明天。timetriesall.时间检验一切...