我们发现乐观主义是最嘹亮的号角，召唤我们行动起来；乐观主义还具有放大效应——为美好未来奋斗的乐观主义者越多，我们就越有理由感到乐观。We find that optimism is the loudest call to action.Optimism also has a magnifying effect. The more optimists we have to fight for a better future, the more reason we have to be optimistic.——比尔·盖茨
