Nothing is difficult to the man who will try. 世上无难事,只要肯登攀。 Don't trouble trouble until trouble troubles you. 不要自寻烦恼。 (事情没有发生前,不要胡思乱想。) There is no end to learning. 学无止境。 Remember: Keep smile on your face. 记住:面带微笑。 Little leaks sink the ship. 小漏洞会使一条船沉没。 千里长堤,溃于蚁穴。