People plant trees in the Xixi National Wetland Park in Hangzhou, East China's Zhejiang province, March 10, 2019. A total of 30 families planted trees at the wetland park on Sunday to greet the upcoming Arbor Day. [Photo/Xinhua]

A child waters a tree in the Xixi National Wetland Park in Hangzhou, East China's Zhejiang province, March 10, 2019. A total of 30 families planted trees at the wetland park on Sunday to greet the upcoming Arbor Day. [Photo/Xinhua]

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