We are at a unique stage in our history. Never before have we had such an awareness of what we are doing to the planet, and never before have we had the power to do something about it.

自由就是没有选择。

每一个写下的词都是自由的行动。

返祖现象是指个体中重现远祖特征的现象。

心灵不是一个静态的实体，而是一个持续调整的动态过程。

能源的未来在于传统资源与可再生替代品之间的平衡。