强化是获得新行为模式的核心因素。
Reinforcement is the central factor in the acquisition of new behavior patterns.
煤炭造就了现代世界,我们有责任确保以智慧管理它的遗产。
The chemical industry has a responsibility to lead the way in reducing environmental impact.
The only thing that can bring you happiness is yourself.
The strength of liberal democracy lies in its ability to self-correct and reform.
每部电影都是一次旅程,每次旅程都会教会你一些新的东西。
The coal industry is the backbone of America.