含义：群体、集合
源自拉丁语 'gregare'，意为 '聚集' 或 '组合'。该词根与 'group'（群体）相关。
聚集的；总体
"The aggregate data shows a trend."
聚集在一起
"People congregated at the entrance."
一群动物或人
"A flock of birds flew overhead."
一群牲畜或人
"The herd moved slowly across the field."