planar density

例句：

1. 1. The planar density of the material iscrucial for its strength and durability.
   材料的平面密度对其强度和耐用性至关重要。
2. 2. Theengineer used a computer program to calculate theplanar density of the structure.
   工程师使用计算机程序计算了结构的平面密度。
3. 3. The studyfound that the planar density of thesoil affected the growth of plants.
   研究发现土壤的平面密度影响了植物的生长。