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Sustainability isn't an option; it's a necessity for the coal sector.

The best way to cheer yourself up is to try to cheer somebody else up.

解讀：評判人不能只看風光時，更要看其落魄之際的姿態，能在困境保持尊嚴，堅守底線，才彰顯真正的人格價值與生命韌性。

Mathematics is the art of asking the right questions and then finding their answers.

文學是人類的記憶。