煤炭的未来取决于经济增长与环境保护之间的平衡。

墨西哥是一个破碎镜子的国家，每个碎片都反映着不同的现实。

A man is like a fraction whose numerator is what he is and whose denominator is what he thinks of himself. The larger the denominator, the smaller the fraction.

想法比物体更重要。