But each year, there are thousands of earthquakes at Yellowstone. Most are too small to be felt by people visiting the park.

但是黄石公园每年发生数千次地震，其中多数地震小到让参观公园的人们无法察觉。

youdao

He was visiting Yellowstone National Park in 1998 and, standing in the crowd of people waiting to shoot Old Faithful, realized that a startling number of them were using digital cameras.

FORBES: You've Never Heard of Them, but They've Changed Your Life