Answer: a sudden increase in the number of people arriving at the same time.
The waves mean a sudden increase in the number of people arriving in the same period.
The Hindu kush is an 800 km long mountain range and lies in central and southern Asia to the west of the Himalayas. It stretches formmthe western and centrla afghsnistan. Having an elevation of 7,708 meters. The waves in the statement mean the rise of the number of people that cross the mountains.
Find out more information about the Hindu Kush.
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