Definition
To be engaged in the process of working.
工作中
The farmers are currently at work in the fields.
农民们目前正在田里工作。
The designers are at work designing the new product.
设计师们正在设计新产品。
The engineers are at work trying to solve the complex problem.
工程师们正在努力解决这个复杂的问题。
To be in the process of having an effect, typically a noticeable or negative one.
起作用（常指起负面作用）
The effects of the economic downturn are at work, negatively impacting small businesses.
经济衰退的影响正在发酵，对小型企业产生了负面影响。
The power of rumors is at work, undermining trust between team members.
谣言的威力正在发挥作用，破坏了团队成员之间的信任。
The effects of climate change are at work in various regions.
气候变化的影响正在各个地区显现。