A local farmer picks olives in an olive orchard on the outskirts of Tunis, Tunisia, on Dec. 15, 2019. Tunisia is the world's major exporter of olive oil. The cultivation and processing of olives is an important industry in Tunisia. (Photo by Adele Ezzine/Xinhua)

Local farmers pick olives in an olive orchard on the outskirts of Tunis, Tunisia, on Dec. 15, 2019. Tunisia is the world's major exporter of olive oil. The cultivation and processing of olives is an important industry in Tunisia. (Photo by Adele Ezzine/Xinhua)

People work at an olive oil processing plant on the outskirts of Tunis, Tunisia, on Dec. 15, 2019. Tunisia is the world's major exporter of olive oil. The cultivation and processing of olives is an important industry in Tunisia. (Photo by Adele Ezzine/Xinhua)

Photo taken on Dec. 15, 2019 shows olives matured for harvest in an olive orchard on the outskirts of Tunis, Tunisia. Tunisia is the world's major exporter of olive oil. The cultivation and processing of olives is an important industry in Tunisia. (Photo by Adele Ezzine/Xinhua)

Local farmers pick olives in an olive orchard on the outskirts of Tunis, Tunisia, on Dec. 15, 2019. Tunisia is the world's major exporter of olive oil. The cultivation and processing of olives is an important industry in Tunisia. (Photo by Adele Ezzine/Xinhua)

People work at an olive oil processing plant on the outskirts of Tunis, Tunisia, on Dec. 15, 2019. Tunisia is the world's major exporter of olive oil. The cultivation and processing of olives is an important industry in Tunisia. (Photo by Adele Ezzine/Xinhua)