检验假设有效性的唯一相关标准是其预测与经验的比较。

The balance between production and conservation is delicate, but achievable.

Thought is the means by which the organism negotiates its way through the world.

Every problem in NP can be reduced to the satisfiability problem, which is the cornerstone of computational complexity theory.

城市是一个有生命的实体，建筑必须对此作出回应。