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- To fail to keep up a pace; lag behind. 落后跟不上步伐；落后
- To fail to keep up a pace;lag behind. 落后跟不上步伐；落后
- To fail to keep up a pace;straggle. 跟不上；落伍
- To fail to keep up a pace; straggle. 跟不上；落伍
- To fail to keep a commitment or promise. 失言没有履行义务或诺言
- Castles in the air cost a vast deal to keep up. 空中楼阁，要有一大笔费用来维持。
- It must be very costly to keep up a large house like this. 维修这样一所大房屋一定得花不少钱。
- A pianist has to practice every day to keep up to scratch. 钢琴手要天天练习才能保持高水平。
- Rarely did he fail to keep his promise. 他真的很难得失信。
- We must try to keep up a consistently high standard. 我们必须始终努力保持高标准。
- If they fail to keep up with the requirement of the development of productive forces and have thus become obstacles to the development of productive forces and social progress ,readjustments and changes are sure to take place. 如果它们不能适应生产力发展的要求，而成为生产力发展和社会进步的障碍，那就必然要发生调整和变革。
- To fail to accomplish, achieve, or attain(a goal). 没完成、未取得或未达到（目标）
- I was put to it to keep up with his pace. 我跟上他是不容易的。
- It must be very costly to keep up a house like this. 维修这么一幢房子一定很昂贵。
- To fail to discharge. Used of a firearm. 不发火发火失败，用于灭火器
- Draw a blank To fail to find or remember something. 找不到或忘记某物。
- If they fail to keep up with the requirement of the development of productive forces and have thus become obstacles to the development of productive forces and social progress , readjustments and changes are sure to take place. 如果它们不能适应生产力发展的要求，而成为生产力发展和社会进步的障碍，那就必然要发生调整和变革。
- To fail to confront a subject directly. 不能直接切入主题。
- You see,we really want you to keep up a running conversation with us. 你知道，我们的确希望你能不断地与我们对话。
- The governor was attacked by the press for failing to keep a campaign promise. 州长因没能履行一项竞选时的承诺而受新闻界抨击。
