A woman feeds her child at Vial refugee camp of Chios, Greece, on Dec. 23, 2019. Some 90,000 refugees and migrants currently stranded in Greece, including 34,700 on islands, according to the latest official data from Greek authorities. (Photos: Xinhua)

Laundry is hanged near Vial refugee camp of Chios, Greece, on Dec. 24, 2019. Some 90,000 refugees and migrants currently stranded in Greece, including 34,700 on islands, according to the latest official data from Greek authorities.

Children play at Vial refugee camp in Chios, Greece, on Dec. 23, 2019. Some 90,000 refugees and migrants currently stranded in Greece, including 34,700 on islands, according to the latest official data from Greek authorities.

People walk among the tents at Vial refugee camp of Chios, Greece, on Dec. 23, 2019. Some 90,000 refugees and migrants currently stranded in Greece, including 34,700 on islands, according to the latest official data from Greek authorities.

A woman walks among the tents at Vial refugee camp of Chios, Greece, on Dec. 23, 2019. Some 90,000 refugees and migrants currently stranded in Greece, including 34,700 on islands, according to the latest official data from Greek authorities.

Refugees stand in the rain at the Vial refugee camp in Chios, Greece, on Dec. 23, 2019. Some 90,000 refugees and migrants currently stranded in Greece, including 34,700 on islands, according to the latest official data from Greek authorities.

Children play at Vial refugee camp in Chios, Greece, on Dec. 23, 2019. Some 90,000 refugees and migrants currently stranded in Greece, including 34,700 on islands, according to the latest official data from Greek authorities.

An injured man from Iraq is seen in his tent at Vial refugee camp in Chios, Greece, on Dec. 23, 2019. Some 90,000 refugees and migrants currently stranded in Greece, including 34,700 on islands, according to the latest official data from Greek authorities.

A child stands inside his tent at Vial refugee camp of Chios, Greece, on Dec. 23, 2019. Some 90,000 refugees and migrants currently stranded in Greece, including 34,700 on islands, according to the latest official data from Greek authorities.

Photo taken on Dec. 24, 2019 shows the Vial refugee camp in Chios, Greece, on Dec. 24, 2019. Some 90,000 refugees and migrants currently stranded in Greece, including 34,700 on islands, according to the latest official data from Greek authorities.