The professor had previously heard from those who had been to the battlefield that when shells fly overhead, you can hear a whistle-like sound.
Scientists say that this is the shell rapidly tearing through the air during flight, causing air vibrations and emitting a sharp screeching sound.
Previously, the professor, along with many others, had no direct concept of this; they hadn't actually been to the battlefield, so it was hard to verify whether this claim was true or false.
But at this moment, they believe it must be true!
This is the tourist dock, where almost everyone who comes to Golden Port City or needs to take a ship to leave from Golden Port City stops.
He watched as a crowd ran toward them from afar, perhaps fifty or sixty people, or maybe seventy or eighty, anyway a large group.
Some were carrying luggage, some had abandoned their luggage entirely, and some were dragging their family members, running with all their might.
