酸和碱不是绝对的，而是相对的。

Thoughts are the shadows of our feelings always darker， emptier， simpler.

True progress happens when we listen to both scientists and farmers.

"We do not lack communication, on the contrary, we have too much of it. What we lack is creation."

The concept of reducibility is central to understanding the relationships between different computational problems.

Legal systems are not static; they evolve over time in response to social changes.