cylinder cowling是什么意思

用法例句

The experiment has proved that mucilage at the extrude die with conicylindricalpassage is better than that with cylindrical passage in extruding condition and production.

由实验证明胶丝挤出口模圆锥形通道比圆柱形通道能改善挤出条件，提高挤出质量。