compactness meter

例句：

1. 1. The compactness of the new design makes it more user-friendly.
   新设计的紧凑性使其更易于使用。
2. 2. The compactness meter is used to measure the compactness of materials.
   紧凑度计用于测量材料的紧凑度。
3. 3. The compactness meter was invented by a scientist who wanted to improve the efficiency of his machine.
   紧凑度计是由一位科学家发明的，他想提高他机器的效率。