A:长江后浪推前浪,世上今人胜古人
B:若使年华虚多过,到老空留后悔心
C:三百六十行,行行出状元
D:冰生于水而寒于水,青出于蓝而胜于蓝
翻译这首诗
If something happens , it happens quickly and unexpectedly (意料之外的).
已知x=y≠﹣12,且xy≠0,下列各式:①x﹣3=y﹣3; ②5x=y5;③x2y+1=y2x+1;④2x+2y=0,其中一定正确的有( )