rung
/rʌŋ; rʌŋ/ n[C]
1 cross-piece forming a step in a ladder （梯子的）横档, 梯级. =>illus at ladder 见 ladder 插图.
2 cross-piece joining the legs of a chair, etc to strengthen it （椅子等腿间的）横档.
3 (fig 比喻) level or rank in society, one's career, an organization, etc （社会、 职业、 组织等的）阶层, 等级
start on the lowest/bottom rung of the salary scale 从最低级别的薪金开始
His promotion has moved him up several rungs on the management ladder. 他获得提升, 在管理阶层中提高了好几级. rung, 2 pp of ring2.