Profit without purpose is ultimately unsustainable.

The leather industry must adapt to changing consumer demands or risk becoming obsolete.

The merit of Marx is that he suddenly produces a qualitative change in the history of social thought. He interprets history, understands its dynamic, predicts the future, but in addition to predicting it, he expresses a revolutionary concept: the world must not only be interpreted, it must be transformed.

伟大的音乐得以幸存不是因为保存它的机构，而是因为每一代人都重新发现它。

I adore art. when I am alone with my notes， my heart pounds and the tears stream from my eyes， and my emotion and my joys are too much to bear.

电子是最重要的化学实体。