例句：
The area has a wealth of bird life.
这个地区栖息着大量的鸟。
The bird had escaped from captivity.
那只鸟已经逃离樊笼。
The bird disappeared into the scrub.
鸟消失在矮树丛中。
The bird flapped its wings furiously.
那只鸟使劲地拍打着翅膀。
There was a bird perched on the roof.
有一只鸟落在屋顶上。
A bird had pecked a hole in the sack.
一只鸟把袋子啄了个洞。