be up to grade什么意思

grade什么意思?速度 英语翻译pick up和pick-up有什么区别?意思各是什么?How to be a pick-up artist?这 to be made up of 的意思 be up to date的意思? be up to sth 忙于意思时 up to now什么意思? Be fed up with amativeness什么意思 know I need to step up and be strong 什么意思 when he grous up ,he is going to be an engineer什么意思 what are you going to be when you grow up? 什么意思 I'll be up/down to see you tomorrow. 什么意思? How to be a Grade Nine student