slight negative pressure的意思|示意

The detection systemcould not press or squeeze the egg like the graders did, but what would happenif they could pull on the egg with a slight negative pressure, or vacuum?

检测系统不能像分级员一样按压或挤压鸡蛋。 然而，如果它们能够用极小的负压或真空把鸡蛋牵引起来，结果会怎样呢？

Extreme lumber disc herniation mainly showed radiating pain of sciatic nerve, besides slight lumbago, negative Bragards test and location sign of pressure epistatic or inferiority nerve root.

腰椎极外侧椎间盘突出，以坐骨神经放射痛为主，腰痛轻微、抬腿试验可以阴性，可有上位或下位神经根受压定位体征；