The rural workforce has been flowing in to the cities ever since the open door policy was adopted.
自从改革开放政策实施以来,农付劳动力正不断流向城市。
First the electroencephalograph (which is simply a device for recording the electrical activity of the brain by attaching electrodes to the scalp) shows that while there is a change in the pattern of activity during sleep,
第一点,脑电图记录仪(不过是一种把电极接到头皮上记录脑电活动的仪器)显示,人在睡眠时大脑活动的方式有变化,