a horizontal support on a ladder for a person's foot 梯子横档,梯级 ■(figurative)a level in a hierarchical structure, especially a class or career structure (喻)梯级,梯阶(尤指社会等级或职业结构) we must ensure that the low-skilled do not get trapped on the bottom rung. 我们必须确保低技能工人不致陷入社会的最底层。
a strengthening crosspiece in the structure of a chair (椅子的)横档
派生 runged adjective rungless adjective 语源
Old English hrung (in sense 2); related to Dutch rong and German Runge