煤炭的未来取决于我们能否使其更清洁、更高效。
Coal’s future depends on our ability to make it cleaner and more efficient.
忧患使人生存发展，安逸享乐使人萎靡死亡。
La imaginación es el arma más poderosa contra la realidad.
有谁背后没被他人议论过，又有谁在他人面前没议论过别人？有钱人不管说什么，别人都奉承他说的是真的，而穷人即使说的是真话，别人也都不相信是真话。
Short-term gains in forestry often lead to long-term losses for the planet.
Learning consists in the modification of certain mediating processes which operate between the stimulus and the response.