将砂土颗粒的接触方式分为完善联结和滑动联结。
The contact among grains can be classified as perfect contact and sliding contact.
所以，研究尘土颗粒对电接触可靠性的影响具有很重要的现实意义。
So it is very important and necessary for us to research the influence of dust on electric contact.
由此，本发明所使用的模具不会与硬质颗粒相接触，用以避免模具造成损坏。
In this way, the molds will not contact with the hard grains to avoid damage.
由此，本发明所使用的模具不会与硬质颗粒相接触，用以避免模具造成损坏。
In this way, the molds will not contact with the hard grains to avoid damage.
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