Doves are seen at the Potala Palace in Lhasa, capital of southwest China`s Tibet Autonomous Region, March 4, 2018, as the weather warms up recently. [Photo/Xinhua]

The willow branches germinate near the Potala Palace in Lhasa, capital of southwest China`s Tibet Autonomous Region, March 4, 2018, as the weather warms up recently. [Photo/Xinhua]

Flowers are seen in Lhasa, capital of southwest China`s Tibet Autonomous Region, March 4, 2018, as the weather warms up recently. [Photo/Xinhua]