无形

例句：

1. 1. The invisible force of gravity is always pulling us down.
   重力的无形力量总是在吸引我们。
2. 2. The scientist was able to detect the invisibility cloak by analyzing the emitted radiation.
   科学家通过分析发射的辐射来检测隐形斗篷。
3. 3. Invisible to the naked eye, this substance can be seen under a microscope.
   这种物质肉眼看不见，但在显微镜下可以看到。