股市的短期波动是不可预测的，但长期趋势是可以预测的。
The stock market is unpredictable in the short term, but predictable in the long term.
Energy efficiency is the unsung hero in our quest to reduce emissions.
我了解到你无法控制生活中的一切，这没关系。
Liberal democracy may constitute the "end point of mankind's ideological evolution" and the "final form of human government," and as such constituted the "end of history."
不要提出任何你不能通过实验证明的东西。
