要把社区工作做好，协作活动是必不可少的。
Cooperative activity is essential to effective community work.
Activities：它可帮助用户进行活动管理，并为计划协作活动提供集中控制。
Activities: This helps users for activity management and provides a centralized console for planning collaborative activities.
每一次搜索，我们都在参与一种协作活动，虽然没有意识到，但它能够为后来者提供更好的搜索结果。
With each search, we unknowingly participate in a cooperative design that improves the search experience for all searchers to follow.
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