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Technicians check the the condition of photovoltaic (PV) solar panels at a PV station beside a greenhouse in Wuyi County, north China's Hebei Province, on March 30, 2019. (Xinhua/Li Xiaoguo)

Technicians check the the condition of photovoltaic (PV) solar panels at a PV station beside a greenhouse in Wuyi County, north China's Hebei Province, on March 30, 2019. (Xinhua/Li Xiaoguo)