定义
to be hard at work: 忙于工作
The Research and Development department is hard at work creating new perfumes. 研发部门忙于开发新的香水品种。
- "Susie, I know you are hard at work planning the TigerLily campaign, but please spare some time and try to create a marketing gimmick to sell these excess perfumes."
进一步了解…
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