Communities
n. 社区；团体, 群体（community的复数形式）
🗣️ 情景例句
You should perform what you promised to do.
你应该履行诺言。
You're getting on my nerves!
你很烦耶！
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，