但也可按照产品图纸要求标在护罩、保持架、挡圈，密封或防尘装置的端面上。

But can also be marked in accordance with the requirements of Product drawings at guard and maintain the planes, ring, seal, or device-side surface dust.

youdao

在提前器从动盘上设计了一个挡油环形结构，并将原来的双骨架密封结构改为单骨架结构加O型圈密封结构。

There was a new ringed structure on the driven pan to push back the oil and we also used single framework with one O ring instead of double framework to seal the oil.

youdao