swell wall的意思|示意

He looks back, hoping to find another swell; but this time a towering wall of water is moving toward him.

他回头看希望再发现一个浪头；但是这一回是一堵矗立的水墙在向他移动。

The research advances about die swell, the reduction of friction between die wall and polymer melt, wall slip and melt fracture in polymer extrusion are described in the paper.

对有关挤出胀大、减粘降阻、熔体破裂及壁面滑移的研究进展进行了综述，指出气辅挤出技术是解决以上问题的有效方法。