vi.(鸽)咕咕地叫,低声软语地说,温柔亲切地说
vt.(鸽)咕咕地叫,温柔可爱地说话
n.咕咕声,鸽子的叫声
He must quit himself before Mk. Coo dismissed him.
他不能等曹先生辞他,只好自己先滚吧!
Coo, look at him!
唔,你看看他!
She paused to coo at the baby.
她停下来,轻声地对着婴儿说话。