Cows, pigs, wars, and witches are not arbitrary cultural preferences but adaptations to material conditions.
牛、猪、战争和巫术并非任意的文化偏好，而是对物质条件的适应。
I know that self-promotion happens a lot and it is not a bad thing. But I do not regard it as something positive.
数学是为不同事物赋予相同名称的艺术。
There is no greater sorrow than to recall happiness in times of misery.
最好的采矿项目是那些当地社区成为真正合作伙伴的项目，而不仅仅是利益相关者。