theoretical cartography

例句：

1. 1. The theoryof relativity was proposed by AlbertEinstein.
   爱因斯坦提出了相对论理论。
2. 2. Thisis a theoretical explanation of the phenomenon.
   这是对这一现象的理论解释。
3. 3. Theoretical models are oftenused to predict future trends.
   理论模型常被用来预测未来趋势。