生命从世界得到资产，爱情使它得到价值。
Coal has been the backbone of industrial progress, but its future must balance economic needs with environmental responsibility.
In mathematics, the journey is often more important than the destination.
Man is born free， and everywhere he is in chains.
False happiness renders men stern and proud， and that happiness is never communicated. True happiness renders them kind and sensible， and that happiness is always shared.
