煤炭是我国的主体能源，在相当长时期内仍将是我国能源安全的基石。

每一个词都是一个世界。

大缓和时期是一段显著的经济稳定时期，但它为大衰退埋下了种子。

Understanding the real lives of the poor is the first step toward designing effective policies to help them.

成功是个糟糕的老师。它让聪明人认为他们不能失败。

We don't have anything to lose, which is a very liberating feeling.

我相信孩子是我们的未来。好好教导他们，让他们引领道路。

The biggest risk is not taking any risk. In a world that’s changing quickly, the only strategy that is guaranteed to fail is not taking risks.

译文：过去的时间逝去了不可追回，今天的日子也会在转瞬之间过去。赏析：已经过去的就让它过去，不必再追悔。我们要活在当下，珍惜每一天。与其用泪水悔恨昨天，不如用汗水拼搏今天。