Books are the quietest and most constant of friends; they are the most accessible and wisest of counselors, and the most patient of teachers.

不同凡想。

Modern forestry must balance three axes: ecology, economy and ethics.

衡量矿业公司成功的真正标准不仅在于其财务报表，还在于它对社区留下的持久积极影响。

在心理学领域，正常与异常之间的界限往往是模糊和主观的。