Workers collect tea leaves at a tea garden in Lincheng county, North China’s Hebei province, May 2, 2018.[Photo/Xinhua]

A worker selects tea leaves at a tea garden in Lincheng county, North China’s Hebei province, May 2, 2018.[Photo/Xinhua]

Workers pick tea leaves at a tea garden in Lincheng county, North China’s Hebei province, May 2, 2018.[Photo/Xinhua]

A worker picks tea leaves at a tea garden in Lincheng county, North China’s Hebei province, May 2, 2018.[Photo/Xinhua]