... 正直流电极 direct-current electrode positive 支撑垫圈 back-up washer 支撑阀 lift valve ...
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... back-up source || 后备电源，备用电源 back-up washer || 保护垫圈，支撑垫圈 back-wall cell || 后壁式电池 ...
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Back-up rings are washer-like devices that are used to prevent a seal from extruding through any gaps while under pressure.
备份环形状类似垫圈，用途为防止密封件遭到挤压。
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