Aerial photo taken on March 20, 2019 shows workers picking tea leaves at a tea garden in Longwucha village of Hangzhou, capital of East China's Zhejiang province. Hangzhou is a major production region of China's Longjing tea. [Photo/Xinhua]

Workers pick tea leaves at a tea garden in Longwucha village of Hangzhou, capital of East China's Zhejiang province, March 20, 2019. Hangzhou is a major production region of China's Longjing tea. [Photo/Xinhua]

A worker displays the freshly picked tea leaves at a tea garden in Longwucha village of Hangzhou, capital of East China's Zhejiang province, March 20, 2019. Hangzhou is a major production region of China's Longjing tea. [Photo/Xinhua]

A local farmer (L) picks tea leaves with workers at a tea garden in Longwucha village of Hangzhou, capital of East China's Zhejiang province, March 20, 2019. Hangzhou is a major production region of China's Longjing tea. [Photo/Xinhua]

Sun Dexiang stir-dries tea leaves in Longwucha village of Hangzhou, capital of East China's Zhejiang province, March 20, 2019. Hangzhou is a major production region of China's Longjing tea. [Photo/Xinhua]

Aerial photo taken on March 20, 2019 shows workers picking tea leaves at a tea garden in Longwucha village of Hangzhou, capital of East China's Zhejiang province. Hangzhou is a major production region of China's Longjing tea. [Photo/Xinhua]