Optimism is a tool with which you can accomplish the goals you have set for yourself.
乐观是一种工具,你可以用它来实现你为自己设定的目标。
We must balance the need for energy with the need to protect our planet.
正如几何学最自然的起点是数学点,在观察和自然历史中采用同样的方法也最真实、简单且富有教益。
The surest way to corrupt a youth is to instruct him to hold in higher esteem those who think alike than those who think differently.