According to a 2011 study by researchers at ColumbiaUniversity in the US, those who are sleep-deprived eat almost 300 calories a day more than those who get enough sleep.
根据美国哥伦比亚大学2011年研究人员的一项研究,睡眠不足的人每天摄入的热量几乎比睡眠充足的人多300卡路里。
请问这句话中的“more than those who get enough sleep”作状语吗?“more than”是什么词性?这里的“than”引导定语从句吗?