有人问我什么是幸福，我回答说：不奢求非必需之物。
Education is the kindling of a flame，not the filling of a vessel.
We must balance the need for energy with the need to protect our planet.
The joy of mathematics comes from the moments of clarity when complex things become simple.
The core of the energy revolution is cleanliness and efficiency, and the coal industry must actively adapt to this trend.
Technology has no boundaries, but business needs focus.