Visitors are seen at the venue of the 7th Beijing Agriculture Carnival in Changping District of Beijing, capital of China, March 16, 2019. Innovative agricultural landscapes, new agricultural varieties and advanced agricultural techniques are presented to the visitors during the agriculture carnival which kicked off on Saturday. (Xinhua/Zhang Chenlin)

Visitors pick strawberries during the 7th Beijing Agriculture Carnival in Changping District of Beijing, capital of China, March 16, 2019. Innovative agricultural landscapes, new agricultural varieties and advanced agricultural techniques are presented to the visitors during the agriculture carnival which kicked off on Saturday. (Xinhua/Zhang Chenlin)

People visit a rice paddy during the 7th Beijing Agriculture Carnival in Changping District of Beijing, capital of China, March 16, 2019. Innovative agricultural landscapes, new agricultural varieties and advanced agricultural techniques are presented to the visitors during the agriculture carnival which kicked off on Saturday. (Xinhua/Zhang Chenlin)

Visitors are seen at the venue of the 7th Beijing Agriculture Carnival in Changping District of Beijing, capital of China, March 16, 2019. Innovative agricultural landscapes, new agricultural varieties and advanced agricultural techniques are presented to the visitors during the agriculture carnival which kicked off on Saturday. (Xinhua/Zhang Chenlin)