煤炭的真实成本必须既考虑其即时价值，也考虑其对社区和生态系统的长期影响。

Markets are efficient enough that most investors will not outperform the market over the long term.

The essence of computer science is the study of algorithms and their efficiency.

DNA的结构不仅仅是一个发现；它是生物学上的一场革命。