keep up:保持,继续,维持 例句与用法: 1. The enemy kept up their bombardment day and night. 敌军一直日夜不停地狂轰滥炸。 2. The high cost of raw materials is keeping prices up. 原料费用昂贵使得产品价格居高不下。 3. The house is becoming too expensive for them to keep up. 他们的房子维修费用贵得越来越修不起了。 4. I can't keep up with all the changes in computer
1.If you keep on doing something, you do it repeatedly or continue to do it.如果keep on做某事，表示反复或继续做某事。同时说明keep on的后面要用动名词～～2.If you keep someone on, you continue to employ them
