![Four-year-old boy Zhang Jiabo roller-skates in a tunnel on the cliff of a mountain during a roller skating challenge to mark the World Earth Day in th Stock Photo - Alamy Four-year-old boy Zhang Jiabo roller-skates in a tunnel on the cliff of a mountain during a roller skating challenge to mark the World Earth Day in th Stock Photo - Alamy](https://c8.alamy.com/comp/W8K91C/four-year-old-boy-zhang-jiabo-roller-skates-in-a-tunnel-on-the-cliff-of-a-mountain-during-a-roller-skating-challenge-to-mark-the-world-earth-day-in-th-W8K91C.jpg)
Four-year-old boy Zhang Jiabo roller-skates in a tunnel on the cliff of a mountain during a roller skating challenge to mark the World Earth Day in th Stock Photo - Alamy
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Chinese participants roller-skate in a tunnel on the cliff of a mountain during a roller skating challenge to mark the World Earth Day in the Wangmang Stock Photo - Alamy
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![Four-year-old boy Zhang Jiabo roller-skates in a tunnel on the cliff of a mountain during a roller skating challenge to mark the World Earth Day in th Stock Photo - Alamy Four-year-old boy Zhang Jiabo roller-skates in a tunnel on the cliff of a mountain during a roller skating challenge to mark the World Earth Day in th Stock Photo - Alamy](https://c8.alamy.com/comp/W8K91E/four-year-old-boy-zhang-jiabo-roller-skates-in-a-tunnel-on-the-cliff-of-a-mountain-during-a-roller-skating-challenge-to-mark-the-world-earth-day-in-th-W8K91E.jpg)