Mathematics is not a spectator sport—you have to engage with it to appreciate its beauty.

你不能让恐惧阻止你过自己的生活。

投资更清洁的煤炭技术是对能源未来的投资。

煤炭行业要深化供给侧结构性改革，提高供给质量。

We must balance short-term profitability with long-term environmental responsibility.