optimum density

例句：

1. 1. The engineer optimized the design to reduce weight and increase efficiency.
   工程师优化设计以减轻重量并提高效率。
2. 2.The company aims for a maximum density of its workforce in order to achieve its goals.
   该公司旨在其员工队伍中实现最大密度，以实现其目标。
3. 3. The optimal density of the material was determined by measuring its specific gravity.
   通过测量材料的特定密度来确定材料的最佳密度。