你每花一块钱购买一些实质性的东西，预计在其寿命结束时要支付一块钱的维修、保养或处理费用。

"To forget is to lose a part of ourselves, but to remember is to keep it alive."

我不是那种会让对我热情的爱减少的人。

I think about the limits of language.

可持续林业不仅仅是砍伐树木；它关乎我们星球的未来。

Mental processes exist because they have served life's continuance.

"In observational studies, we often have to rely on assumptions that are not directly testable."