People attend a celebration in Xigaze, southwest China's Tibet Autonomous Region, Jan. 19, 2018. Local people of Tibetan ethnic group have replaced prayer flags by new ones on the mountain and houses to celebrate New Year under the Tibetan calendar. (Xinhua/Purbu Zhaxi)

A man replaces new prayer flags on his house in Xigaze, southwest China's Tibet Autonomous Region, Jan. 19, 2018. Local people of Tibetan ethnic group have replaced prayer flags by new ones on the mountain and houses to celebrate New Year under the Tibetan calendar. (Xinhua/Purbu Zhaxi)

A man throws prayer flags in the air in Xigaze, southwest China's Tibet Autonomous Region, Jan. 19, 2018. Local people of Tibetan ethnic group have replaced prayer flags by new ones on the mountain and houses to celebrate New Year under the Tibetan calendar. (Xinhua/Jigme Dorge)

People replace new prayer flags in Xigaze, southwest China's Tibet Autonomous Region, Jan. 19, 2018. Local people of Tibetan ethnic group have replaced prayer flags by new ones on the mountain and houses to celebrate New Year under the Tibetan calendar. (Xinhua/Purbu Zhaxi)

People replace new prayer flags in Xigaze, southwest China's Tibet Autonomous Region, Jan. 19, 2018. Local people of Tibetan ethnic group have replaced prayer flags by new ones on the mountain and houses to celebrate New Year under the Tibetan calendar. (Xinhua/Jigme Dorge)

People replace new prayer flags in Xigaze, southwest China's Tibet Autonomous Region, Jan. 19, 2018. Local people of Tibetan ethnic group have replaced prayer flags by new ones on the mountain and houses to celebrate New Year under the Tibetan calendar. (Xinhua/Jigme Dorge)

A ceremony is held in Xigaze, southwest China's Tibet Autonomous Region, Jan. 19, 2018. Local people of Tibetan ethnic group have replaced prayer flags by new ones on the mountain and houses to celebrate New Year under the Tibetan calendar. (Xinhua/Purbu Zhaxi)

People replace new prayer flags on the mountain in Xigaze, southwest China's Tibet Autonomous Region, Jan. 19, 2018. Local people of Tibetan ethnic group have replaced prayer flags by new ones on the mountain and houses to celebrate New Year under the Tibetan calendar. (Xinhua/Purbu Zhaxi)