人们需要了解一些他们在团体中没有很好理解的贡献。
People who need to understand something that isn't well-understood within the community.
他们贡献出了自己的时间，比赛没有他们将不可能成功举办。
They're volunteering their time and the race would not be successful without them.
他们贡献出了自己的时间，比赛没有他们将不可能成功举办。
They're volunteering their time and the race would not be successful without them.
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