计算理论为理解什么可以计算、什么不能计算提供了基础。
The theory of computation provides a foundation for understanding what can and cannot be computed.
社会结构的研究是对社会关系系统的研究。
Sustainability isn't an option; it's a necessity for the survival of our industry.
释义：脸上没有愤怒的表情是对他人的尊重，嘴里不说愤怒的话会散发出美好的气息。心中没有愤怒是无价的宝藏，这种心态是永恒不变的真理。
We are what we pretend to be, so we must be careful about what we pretend to be.