道德情操论是政治经济学理论的基础。
I like the night. Without the dark, we'd never see the stars.
你最不满意的客户是你最大的学习来源。
The night is a great teacher, but the stars are its lessons.
善恶之间的界限是可渗透的,任何人在环境的逼迫下都可能跨越它。
Every discovery in science is built upon the work of countless others before us.