extrapolation technique

例句：

1. 1.The extrapolation of the population growth rate is a complex task.
   人口增长率的外推是一个复杂的任务。
2. 2. The extrapolation technique is used to predict future trends in the market.
   外推技术被用来预测市场的未来趋势。
3. 3. The extrapolation technique can be used to estimate the cost of building a new bridge.
   外推技术可以用来估计建造新桥梁的成本。