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我喜歡在股票打折時(shí)買(mǎi)入。

The discovery of topological insulators has opened up a new frontier in condensed matter physics, where the interplay of symmetry and topology leads to novel quantum states of matter.

You have to believe in yourself when no one else does.

The artist must be a philosopher and think deeply about the world. Music is not enough； it is a reflection of the world’s beauty and sorrow.

There's a tendency to think that our present politicians are much worse than we had in the past.But we tend to forget how awful our politicians were in the past.