Every mathematical problem has a solution; it just takes time and effort to find it.

幸福不是现成的东西。它来自你自己的行动。

Every stone tells a story, our job is to make it a meaningful one.

Certification schemes are the floor, not the ceiling of responsible forestry practice.

每个词都是通向理解的一步，但也是通向困惑的一步。