Spin one's wheels
付出大量努力却只获得微小回报，强调投入与产出严重失衡。
用于表达对低效或无效工作的沮丧。
例句
The team felt they were spinning their wheels on the marketing campaign with minimal sales increase.
典故来源
同前，源自车辆空转的比喻，强调努力与成果的不匹配。