Cooperation is always the key to success. The sentence is not a joke, but we practice it. There is a story. The leader of the antelopes made a decision when they faced their ferocious enemies. Older antelopes would jump first, then younger antelopes jumped to the elders' backs then to the other side of the cliff. The cooperation between the older and younger antelopes helped them to get free from their enemies. The story tell us only cooperation can help to escape from danger when face danger. You should cooperate with the others to finish homework if you are a student; you should cooperate with other workers to finish a project if you are a worker; you should cooperate with other doctors to save patients if you are a doctor. Anyway, we need cooperation every moment. Cooperation means to work in with each other. We need to operate in many things, and we can't finish them without cooperation. The sentence is "a little cooperation brings a little achievement, a big cooperation brings a big achievement, no cooperation brings no achievement." And it's true.