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经济模型的价值在于其解释和预测的能力。
The value of an economic model lies in its ability to explain and predict.
Every ton of coal we extract carries equal weight in responsibility.
引用李商隐《锦瑟》诗句,表达对往事的怅惘
未来属于那些能够在不给地球或人类留下伤痕的情况下制造皮革的人。
The alternation of motion is ever proportional to the motive force impressed; and is made in the direction of the right line in which that force is impressed.