具体用法请参照stage。仅此提供有关activity的例句，请注意activity在定语从句中的成分。

This energy favors any social activities where new ideas are shared &discussed.

这一周尤其适合分享和讨论新点子的社交活动。

Then promote strong family relationships and encourage kids in activities where they meet other kids.

下一步是增进家人之间的交流，并鼓励孩子和其他孩子一起活动。

It reduces the immune system activity which in turn reduces inflammation.

它降低免疫系统的活性从而减少炎症反应。

His investigations are limited to human activity which could create material value.

他的研究只是限于创造物质价值的人类活动。

It's a creative activity that the family can share and enjoy.

这是全家人都能分享和欣赏的创造性活动。