经济政策应根据其现实影响进行评估。

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

In science, there is no such thing as a final answer.

解析：这句话揭示了道的本质：道是可以阐述说明的，但并非寻常的道理；名是可以命名的，但并非通常的名称。

The universe is a place that is full of surprises, and we are just beginning to understand its mysteries.

Data are profoundly dumb; they tell you nothing about causes and effects.