gravity type structure

例句：

1. 1. The gravity of thesituation demanded immediate action.
   形势的严峻要求立即采取行动。
2. 2. The gravity type structure is a keyfactor in determining the stability of a system.
   重力型结构是决定系统稳定性的关键因素。
3. 3.The gravity type structure is often used todescribe the relationship between two objects or forces.
   重力型结构通常用来描述两个物体或力之间的关系。