unit of observation

例句：

1. 1. The scientist useda unit of observation to measure the distancebetween the stars.
   科学家使用一个观测单位来测量星星之间的距离。
2. 2. The engineer designed aunit of observation that could accurately measure thetemperature inside the building.
   工程师设计了一个观测单位，能够准确测量建筑物内部的温度。
3. 3.The researcher conducted experiments using units ofobservation to study the effects of different lightingconditions on plant growth.
   研究员使用观测单位进行实验，研究不同照明条件对植物生长的影响。