The galactic center is a unique natural experiment in strong gravity.

解析：经常反省检查自己，不给私欲留空间。

I'm a fighter, and I'm not going to give up.

The truth is rarely pure and never simple.

The key to successful investing is to have a clear understanding of the market, the risks involved, a disciplined approach, a long-term perspective, a strong understanding of the fundamentals, a clear understanding of the risks and rewards, and a strong understanding of the market psychology.

体验越强烈，表达就越不清晰。

The stream of thought is the stream of life solving its problems.