Wrap the 'o' Ring in tissue and pull the 'o' Ring through the tissue. This wipes the 'o' Ring clean as it passes through the tissue.

一边用纸巾擦o型圈，一边拉o型圈。这可以让O型圈通过纸巾的时候被擦干净。

youdao

First check assembly O-ring, Disc holder assembly, Cover O-ring and Sensing passage O-ring.

第一止回阀总成O形环，阀瓣固定器总成，阀盖O形环和感应通道O形环。

youdao

Way back in November of 1985, on just its second mission, Atlantis experienced a blow-back of hot gases past the primary O-rings in one of its solid rocket boosters, resulting in serious erosion of said O-ring.

ENGADGET: Space Shuttle Atlantis ends its run of predicting disaster for other NASA shuttles

Some of those Thiokol engineers expected o-ring failures at liftoff.

NPR: Challenger: Reporting a Disaster's Cold, Hard Facts

In the case of the Challenger, the culprit was a simple O-ring that had become too brittle to do its job after a freezing night waiting on the launch pad.

FORBES: BP Oil Spill Investigation Will Focus On Blowout Preventers