1.to make something stay at a high level 使某事物保持在高水平
The high cost of raw materials is keeping prices up.昂贵的原料费用使价格居高不下.
2.to continue something at the same,usually high,level 使某事物保持（在同一水平,通常指高水平）
The enemy kept up the bombardment day and night.敌人昼夜不停地狂轰滥炸.
We're having difficulty keeping up our mortgage payments.我们难以继续偿还按揭贷款.
Well done!Keep up the good work/Keep it up!干得好!继续好好干吧!
3.to make something remain at a high level 使处于高水平；使不低落
They sang songs to keep their spirits up.他们唱歌以保持高昂的情绪.
4.to continue to use or practise something 沿用（或沿袭、保持）某事物
to keep up old customs/traditions 沿袭古老的习俗／传统
Do you still keep up your Spanish?你还坚持说西班牙语吗?
5.to take care of a house,garden/yard,etc.so that it stays in good condition 保养,维护（房屋、花园等）
