经济学家根据过去十年的数据推算出明年GDP的增长趋势。

Economists are ___extrapolating next year's GDP growth trend based on data from the past decade.

仅仅根据过去三天的销售数据来预测全年业绩是不明智的。

It's unwise to ___extrapolate annual performance just from three days of sales data.