internal force diagram

例句：

1. 1.The engineer drew an internal force diagram to analyze the stress distribution in the structure.
   工程师绘制了一张内部力图，以分析结构中的应力分布。
2. 2. The scientist used the internal force diagram to explain the movement of molecules in a gas.
   科学家利用内部力图来解释气体分子的运动。
3. 3. The engineer used the internal force diagram to design the new bridge, which would withstand heavy traffic loads.
   工程师利用内部力图设计了这座新桥，以便承受重载交通。