QUANT
数千;成千上万
If you refer to thousands of things or people, you are emphasizing that there are very many of them.
例句
Thousands of refugees are packed into overcrowded towns and villages...
成千上万的难民涌入拥挤不堪的城镇和村庄。
I must have driven past that place thousands of times.
我得有上千次开车经过那里。