n.喔啊声
动词coo的现在分词形式.
A pigeon is cooing up in one of the elm. 一只鸽子在榆树上咕咕地叫。
He took his girlfriend home after the party and they stayed in the car billing and cooing for a long time before she went into her house. 聚会结束后他送他的女朋友回家，他俩在车上亲昵低语了很久后她才下车进屋。
