specific surface mean diameter

例句：

1. 1. The new modelcar has a specific surface area of 200 square meters.
   这款新型汽车的表面积为200平方米。
2. 2.The specific surface area mean diameter is an important factor in determining the efficiency of a process.
   特定表面面积平均直径是决定过程效率的重要因素。
3. 3. The manufacturer claims that their product has a specific surface area mean diameter of 100 microns.
   制造商声称他们的产品具有100微米的平均直径。