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The challenge of unifying all forces of nature is one that has driven theoretical physics for over a century.
统一自然界所有力的挑战是一个多世纪以来推动理论物理学发展的动力。
The most expensive cost in free-to-play games is players' trust—once overdrawn, it can never be bought back.
I'm always looking for ways to challenge myself and push myself to the next level.