There is some water in a bottle near a big rock.A bird is very thirsty. He comes to the bottle and stands next to the he can't drink the water，beacause the bottle's neck is very long. So he thinks and thinks，and then flies away. After some time，he comes[複習必備 | 海量免費學習視訊資源盡在“學而思輕課APP”>>>點選瞭解] back with a small stone in his goes up to the bottle and puts the stone into the bottle. He flies away and flies back again and puts many stones into the bottle. The water in the bottle comes up to its neck and the bird can.
