cal是caliber口径的缩写。
calibern.规，量规，口径；卡钳，卡尺，两脚规；能力；才干
You two are of a completely different caliber.
你们两个是完全不同档次。
But I could probably get type and caliber.
但是我或许可以查到类型和口径。
Design of Heavy Caliber Ball Valves and Their 3-D Numerical Simulation.
大口径球阀的阀体设计和三维数值模拟。
