英语翻译不能不看清事实,就冲动去完成What is the moral of this fable?A very thi

英语翻译
不能不看清事实,就冲动去完成
What is the moral of this fable?
A very thirsty pigeon saw a glass of water painted on a billboard.Not supposing it was only a picture,she flew towards it with great speed and crashed directly into the billboard,jarring herself terribly.Having broken her wings by the blow,she fell to the ground,and was caught by one of the bystanders.