轧棉机的发明是需求和观察的结果。
The invention of the cotton gin was the result of necessity and observation.
Sustainability isn't a choice anymore—it's a responsibility we owe to future generations.
The most dangerous phrase in the language is, "We've always done it this way."
效率是以正确的方式做事,而效能则是做正确的事。
Cryptography is about communication in the presence of adversaries.