Keep to是一个动介词组 意思是 固守;遵守;坚持
Keep to the deadline遵守最后期限
再如
1.He had been unable to keep to his schedule.x09
他没能遵循自己的计划.
2.Let's keep to the subject,or you'll get me too confused.x09
别跑题,否则你会把我搞糊涂的.
3.Please keep to the paths.x09
请顺着这些小路走.
4.You should always keep to the speed limit.x09
什么时候你都不得超过最高速度限制.
来自《权威词典》
5.He didn't keep to the letter of the contract.x09
他没有严格按照合同的条文办事.
来自《简明英汉词典》