例句：
1、This species of bird is decreasing in numbers every year.
這種鳥的數(shù)量在逐年減少。
2、 The area has a wealth of bird life.
這個地區(qū)棲息著大量的`鳥。
3、The lake is noted as a home to many birds.
這個湖作為許多鳥類的棲息地而聞名。
4、Huge numbers of birds had flocked together by the lake.
成群的鳥聚集在湖邊。
5、 The male and female birds take turns in sitting on the eggs.
雄鳥和雌鳥輪流伏窩。