他向人们发起微探险挑战，并邀请他们将自己的探险制作成四分钟的视频发给他。
He challenged people to go on microadventures and send him four-minute videos of their trips.
要想成功应对此次挑战，关键是回答四个基本问题。
The answers to four basic questions are the key to addressing this challenge successfully.
研究者透过四个研究来检验人们分别如何思考这四个挑战。
Across four studies the researchers examined how people thought about each of these challenges.
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