One of the surprising findings from the new study, published Monday in the journal Archives of Internal Medicine, was just how little it took to knock down defenses against the common cold.
新研究中一项令人吃惊的发现，发表在周一的《内科医学档案杂志》， 即睡眠不足会让感冒抵抗力降到很低。
It drew strength from the not so-young people who braved the bitter cold and scorching heat to knock on doors of perfect strangers.
力量来自不是很年轻的人，他们冒着严寒酷暑，敲开陌生人的家门进行宣传。
It drew strength from the not so-young people who braved the bitter cold and scorching heat to knock on doors of perfect strangers.
力量来自不是很年轻的人，他们冒着严寒酷暑，敲开陌生人的家门进行宣传。
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