Innovation in the energy sector is not optional; it's imperative.

过去是一个异国；他们在那里做的事情不同。

The stock market is a voting machine in the short term and a weighing machine in the long term.

The self is not so much a substance as a process, and it is the continual task of education to change the process, to develop its activities, and to guide it into channels of efficiency.

每一件艺术品都是向观者提出的一个问题。