PCB BACK-UP UP TIME OUT

turn out/back/up/down back-up hold down ,hold up ,hold back ,hold out的含义 get to/up/back/on/off/away/out of by the time I came back they had climbed up.. Hurry up ,we are running ( ) A.out time B.out of time C.out back up和back off when this time was up,he was out of breath Time is running out .Hurry up.的中文意思? back up 的意思? back up ring是什么 back up中文版是什么?