Children play at the Corinth refugee transit camp in Corinth, Greece, on Dec. 8, 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. (Xinhua/Marios Lolos)

Children are seen at the Corinth refugee transit camp in Corinth, Greece, on Dec. 8, 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. (Xinhua/Marios Lolos)

A girl is seen at the Corinth refugee transit camp in Corinth, Greece, on Dec. 8, 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. (Xinhua/Marios Lolos)

A boy takes a shower at the Corinth refugee transit camp in Corinth, Greece, on Dec. 8, 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. (Xinhua/Marios Lolos)

A woman is seen at the Corinth refugee transit camp in Corinth, Greece, on Dec. 8, 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. (Xinhua/Marios Lolos)

A boy is seen at the Corinth refugee transit camp in Corinth, Greece, on Dec. 8, 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. (Xinhua/Marios Lolos)

Children play at the Corinth refugee transit camp in Corinth, Greece, on Dec. 8, 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. (Xinhua/Marios Lolos)

A child is seen at the Corinth refugee transit camp in Corinth, Greece, on Dec. 8, 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. (Xinhua/Marios Lolos)

A child plays at the Corinth refugee transit camp in Corinth, Greece, on Dec. 8, 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. (Xinhua/Marios Lolos)

Women wash clothes at the Corinth refugee transit camp in Corinth, Greece, on Dec. 8, 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. (Xinhua/Marios Lolos)

A girl is seen at the Corinth refugee transit camp in Corinth, Greece, on Dec. 8, 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. (Xinhua/Marios Lolos)

People play football at the Corinth refugee transit camp in Corinth, Greece, on Dec. 8, 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. (Xinhua/Marios Lolos)