sphere of activity

例句：

1. 1. The team is working on a project that spans across multiple spheres of activity.
   该团队正在从事一个跨越多个活动领域的项目。
2. 2.The researcher focused on the sphere of activity where the most significant findings were made.
   研究者专注于最具显著成果的活动领域。
3. 3.The company's success is attributed to its ability to operate in various spheres of activity.
   该公司的成功归功于其在不同活动领域的运营能力。