on top of 和day-to-day在句中怎么理解？ Many people figure it's best to keep on top of day-to-day hypertension by taking all their blood pressure medications in the morning.这是一篇关于高血压的科技文章中的一句话。全文http://www.huanqiukexue.com/html/translate/2011/1028/19124.html