送别
1. （与…）齐步前进；不落后（于…）
If you keep up with someone or something that is moving near you, you move at the same speed.
2. 跟上（变化等）
To keep up with something that is changing means to be able to cope with the change, usually by changing at the same rate.
3. 跟上（活儿、人等）；同…做（或理解）得一样好
If you keep up with your work or with other people, you manage to do or understand all your work, or to do or understand it as well as other people.
4. 了解；熟悉
If you keep up with what is happening, you make sure that you know about it.
5. 继续做（或提供）
If you keep something up, you continue to do it or provide it.
6. 使不减少（或降低）
If you keep something up, you prevent it from growing less in amount, level, or degree.
7. see also: keep 23;25
1. prevent from going to bed at night
e.g. The anticipation of the trip kept the children up all night
I kept myself up all night studying for the exam
2. keep informed
e.g. He kept up on his country's foreign policies
Synonym: keep abreastfollow
3. maintain a required pace or level
e.g. He could not keep up and dropped out of the race
4. keep in safety and protect from harm, decay, loss, or destruction
e.g. We preserve these archeological findings
The old lady could not keep up the building
children must be taught to conserve our national heritage
The museum curator conserved the ancient manuscripts
Synonym: conservepreservemaintain
5. lengthen or extend in duration or space
e.g. We sustained the diplomatic negotiations as long as possible
prolong the treatment of the patient
keep up the good work