将“gravity model"翻译成中文

A gravity model is a popular tool used by trade economists to analyse trade-related policies.

引力模型是贸易经济学家用来分析贸易相关政策的一种流行工具。

Another activity is GRAVMOD, under which gravity models of asteroids are developed and stored in the database.

还有一项活动是“重力模型”,其内容是开发小行星的重力模型并将其存入数据库。