Aerial photo taken on July 10, 2018 shows a river chief and staff workers patrolling in a river in Donglin Town of Huzhou City, east China's Zhejiang Province. The local government has introduced a "river chief for summer" mechanism, in which the river chiefs patrol the river periodically, inspect embankment and river course, and make real-time recording with smartphone APP, to step up flood prevention work. (Xinhua/Xu Yu)