Aou
abbr. 美国鸟类学家协会（American Ornithologists' Union）；表观氧利用（Apparent Oxygen Utilization）
🗣️ 情景例句
Dad! Grandpa! He fell in!
爸爸， 爷爷， 他掉下去了。
Don't you have anything better to do?
你没别的事好做吗？
It's Tree Planting Day. We're going to plant trees in the park along the lake.
明天是植树节。我们要去公园/沿着湖边种树。