Read Edit View history 备用环 bèiyònghuán backup ring Origin Definitions Defs Strokes Stroke Words Sentences Sents created sense approved 备用环/備用環 · bèiyònghuán · backup ring 2026/03/04 备用环 / 備用環 bèiyònghuán backup ring backup ring 备用环通常安装在O型圈的压力侧后面。 created sense Mar 4, 2026, 02:25 AM