Persistence is key in mathematical research; many great results come from long struggles.

Sustainability is no longer an option; it's a necessity for the future of leather tanning.

释义：贫穷和低贱本身并不是耻辱，而通过谄媚、乞求他人来获取利益才是真正的耻辱。

The power of cinema is to make us feel less alone.

循环经济不仅仅是一个理想；它是我们行业的必需品。