The ball screw can be pre pressed, because the pre pressure can make the axial gap reach negative value, and then get higher rigidity.

滚珠丝杠可以加预压，由于预压力可使轴向间隙达到负值，进而得到较高的刚性。

youdao

Pre - pressure need further study because it involves many factors.

预压力与很多因素有关，需作进一步探讨。

youdao

According to flow in a different, balanced spool valve the pressure can be pre-pressure, can also be a back pressure valve.

根据流向不同，平衡阀芯所受的压力可以是阀前压力，也可以是阀后压力。

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And to pre-empt pressure for a fresh vote, Mr Fujimori has started a charm offensive.

ECONOMIST: Peru

Cynics, and there are plenty of them in Syria, dismiss the resolution as one of a series of gestures to pre-empt pressure from America, pressure that has been intensified by the uncomfortable proximity of American forces in Iraq.

ECONOMIST: Arab democratic reform

For the refugee camps in the east, supply lines to the land-locked country are already under pressure as pre-positioning of food starts ahead of the rainy season.

ECONOMIST: Chad: The aftermath | The