数学的本质不是使简单的事情复杂化，而是使复杂的事情简单化。
The essence of mathematics is not to make simple things complicated, but to make complicated things simple.
Un libro es una casa que construimos para que habite el alma del lector.
The future of coal lies in sustainable and responsible mining practices.
Sustainability isn't an option—it's a responsibility we owe to future generations.