每日口說挑戰 睡太多或太少都有事！每天要睡多久才夠？(How much sleep do you really need? | Sleeping with Science, a TED series)

今日挑戰句子

In fact, the Center for Disease Control in the United States, or the CDC, they stipulate a minimum of seven hours of sleep a night for the average adult.

美國疾病管制中心（CDC）表明，一般成年人每晚最少需睡足七小時。