A birdwatcher, armed with a telescope, found the pet sitting desperately on a rock.(一个手持望远镜的观鸟者发现那只宠物绝望地坐在一块石头上。)
A birdwatcher kept an eye on his activities with his large binoculars.Nobody really knows why.(一个鸟类观察者用他的大望远镜观察他的一举一动，没人知道为什么。)
A birdwatcher can never fly with a flock of migrating birds, but a diver can loiter in a shoal of fish.(因为即便是观鸟者也无法与鸟儿一同飞翔，但潜水者却可以和鱼儿共同在水中畅游。)
The whole viewing area was divided into 1600 points. Each birdwatcher was responsible for 25 meters, and was demanded to write down the types and quantities of birds within 24 hours.(整个观察区域分成1600个点，每一个观鸟者要求负责25米的区域范围，并且记下24小时之内所看到的鸟的种类和数量。)
