Figure 1. Annual temperature difference between the big cities and the relative small cities. Solid line shows the result of Beijing minus Chende, and dashed line for Shanghai minus Tunxi.

• 图2.；不同的温度资料体现出来的趋势差别。“”代表陆地气温和海表温度，“(”代表陆地气温和海面气温，“(”代表卫星观测气温