To maintain in good condition:保持良好状态：kept up the property.保存财产
To persevere in; carry on:保持；继续：We asked her to stop talking, but she kept up.我们请她别再说话了，但她依旧说下去
To continue at the same level or pace.并行：按相同的水平或步伐继续下去
To match one's competitors, colleagues, or neighbors in success or lifestyle:不落后，赶得上：赶上对手、同事或邻居，指在成就或生活方式上：unsuccessfully tried to keep up with his associates.没能赶上他的同事们