ring washer
... ring wale ==> 环围木,环形横梁 ring washer ==> 环形垫圈 ring wear ==> 活塞环磨损 ...
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备份环形状类似垫圈，用途为防止密封件遭到挤压。
Back-up rings are washer-like devices that are used to prevent a seal from extruding through any gaps while under pressure.
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