A mathematician's work is never done; there are always new questions to ask and new mysteries to solve.
数学家的工作永无止境;总有新的问题要问,新的谜题要解。
Innovation in plastics isn't optional—it's our responsibility to the planet.
市场总是处于不确定和变化的状态,赚钱是通过对显而易见的事情进行折现并对意外事件下注。