（降低级别） reduce to a lower rank; reduce in rank; sink in the scale; demote; degradation （留级） send (a student) to a lower grade 降级恢复 degraded recovery; ..
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To reduce in rank 使降职
To reduce in grade, rank, or status; demote.
使降级，使降等在级别或地位上降低；使降级。
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