diagram on the plane of the celestial equator

例句：

1. 1. The engineer drew adiagram of the new bridge.
   工程师绘制了新桥的示意图。
2. 2. The scientist used adiagram to explain the process.
   科学家用示意图来解释过程。
3. 3. The architect designed a diagram forthe construction project.
   建筑师为建设项目设计了一张图。