喔啊声

Coo \Coo\, v. i. [imp. & p. p. {Cooed}; p. pr. & vb. n.
{Cooing}.]
1. To make a low repeated cry or sound, like the
characteristic note of pigeons or doves.

The stockdove only through the forest cooes,
Mournfully hoarse. --Thomson.

2. To show affection; to act in a loving way. See under
{Bill}, v. i. ``Billing or cooing.'' --Byron.

cooing \cooing\ adj. [pr. Participle of verb {coo} (definition
2)]
emitting a cry like that of a dove; as, The cooing pigeons.
[WordNet 1.5]