例句：
This species of bird is decreasing in numbers every year.
这种鸟的数量在逐年减少。
The area has a wealth of bird life.
这个地区栖息着大量的鸟。
The lake is noted as a home to many birds.
这个湖作为许多鸟类的栖息地而闻名。
Ten new cases of bird flu were reported yesterday.
昨天新增十例禽流感病例报告。