infinitesimal real number

例句：

1. 1. The scientist used an infinitesimal amount of water to test the experiment.
   科学家使用了极少量的水来测试实验。
2. 2.The engineer calculated the dimensions of the building with infinitesimal precision.
   工程师以极其精确的方式计算了建筑物的尺寸。
3. 3. The physicist discovered a new law about the behavior of matter using infinitesimal quantities of energy.
   物理学家使用极少量的能量发现了关于物质行为的新定律。