Read Edit View history 备用环 bèiyònghuán backup ring Origin Definitions Defs Strokes Stroke Words Sentences Sents 备用环 備用環 bèiyònghuán backup ring a mechanical ring used as a spare or to provide extra support for a seal
备用环 備用環 bèiyònghuán backup ring a mechanical ring used as a spare or to provide extra support for a seal