Aerial photo shows workers clearing away the duckweed in Yangxiagang River in Dongsheng village of Huzhou city, East China’s Zhejiang province, Aug 11, 2018. [Photo/Xinhua]

Workers clear away the duckweed in Yangxiagang River in Dongsheng village of Huzhou city, East China’s Zhejiang province, Aug 11, 2018. [Photo/Xinhua]

Aerial photo shows workers clearing away the duckweed in Yangxiagang River in Dongsheng village of Huzhou city, East China’s Zhejiang province, Aug 11, 2018. [Photo/Xinhua]