air pumping

基本解释

The vacuum freshness preservation box comprises a box body, a cover body, an inflating valve and an air pumping valve.
真空保鲜盒包括盒体，盖体，充气阀和抽气阀。
ip.com
The construction here refers to a new kind of air pumping press, realizing the automatic draw, turn over, push out and removal of the mould.
介绍了一种新型抽真空平板硫化机的结构特点。此机器能实现模具的自动推出、开模、翻转、顶出。
Equations based on hydrodynamics, thermodynamics, gasdynamics and the law of energy conservation are used to find the time required for self-priming and rate of air pumping.
根据流体力学、热力学、气体动力学方程和能量不变方程，求得了自吸时间和抽气速率公式。

He also says they have some techniques to improve the quality of their soups, which includes pumping air into them to make them light and fluffy.
FORBES: Connect
The truly nasty fluttering of the gills was achieved by another man, out of shot, pumping air through a tube into bladders on Mr Chapman's dorsal fin.
ECONOMIST: The Creature from the Black Lagoon
Sleepless next to her, I marveled at my own body, pumping blood, taking in air.
NPR: The Human Body's Frailty and Splendor