The key to credible causal inference is not just the method, but how well the method fits the question at hand.

着眼长期，思考世界上正在发生的结构性变化。

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.

基础设施互联互通对区域经济一体化至关重要。