即将离开知乎
您即将离开知乎,请注意您的帐号和财产安全。
https://www.statista.com/statistics/191207/participants-in-birdwatching-in-the-us-since-2006/#:~:text=Number%20of%20participants%20in%20birdwatching%20in%20the%20U.S.%202006%2D2020&text=In%202020%2C%20there%20were%20approximately,s%20total%20of%2012.82%20million