Scientists have found that people who sleep for less than six and a half hours a night are more ofen ill than people who sleep for eight hours.
是什么意思?
Scientists have found that people who sleep for less than six and a half hours a night are more ofen ill than people who sleep for eight hours.
是什么意思?
科学家发现,每晚睡眠少于六个半小时的人比睡八个小时的人,更容易生病。