能源的真实成本必须同时考虑其生产和遗留影响。
The true cost of energy must account for both its production and its legacy.
Life isn't about how many breaths you take, but about the moments that take your breath away.
成功辨识的关键是找到一个足够灵活的模型结构，以捕捉系统的基本特征，同时又足够简单，可以从现有数据中估计出来。
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.
