a sphere of activity

• 活动范围

a sphere of activity的用法和样例：

例句

1. Animal activity varies in its scope and significance.
   动物的活动，在它们的活动范围和意义上都是不同的。
2. With each passing year, the PMCs expand their influence and scope of activity.
   随着每一年，两个临时市政局扩大其影响力和活动范围。