1. 跟上,不落后：keep up 继续;坚持,维持 | keep up with 跟上,不落后 | kill off 消灭,杀光
2. 向...看齐,跟上：keep to保持,坚持 | keep up with向......看齐,跟上...... | keep up保持,维持;继续,坚持
3. 跟上：keep up your courage保持勇气,别泄气 | keep up with 跟上 | look out 小心,当心;向外看
4. 跟上;赶上：diet n 日常饮食 | keep up with 跟上;赶上 | pace n (一)步;速度;步调