Natural gas is a bridge to a cleaner energy future, but we must cross that bridge responsibly.

教授数学是为了激励下一代的思考者和问题解决者。

We must keep learning to keep up with the times.

将过多的货币锁定在储备中对贸易不利。

在科学问题上，一千个人的权威抵不上一个人的谦卑推理。