(Thanks to Slaanesh Is My Mother for the tip and bonus chapter.)
You He asked in confusion,
"What's a political commissar? Those terrorists?"
With Old Lu's translation, You He and the boatman's grandfather resumed a normal conversation. The boatman's grandfather said,
"They're not terrorists. They're Sweet Star's last backbone.
"When everyone else chose to submit to the Xenos invaders, they were the ones who kept fighting the Xenos!"
You He frowned.
"Grandpa, who are these Xenos invaders you're talking about?"
The boatman's grandfather felt around for his Bolt Pistol and glanced at You He, especially at his distinctive T'au clothing made from special gel.
"Kid, how old are you this year?"
You He answered,
"Twenty-five."
A look of realization flashed through the boatman's grandfather's eyes.
"Twenty-five? Under Imperial law, you had to marry and have children once you reached adulthood at fifteen. Looks like four generations have already passed.
"Only four generations, and you've already forgotten the Imperium completely?"
You He's brow furrowed deeply.
"Grandpa, what is the Imperium? What exactly is the Imperium?!"
He felt that he was already close to the truth, and his words came out rapidly.
The boatman's grandfather raised his Bolt Pistol and pointed to the aquila emblem on the side of the magazine.
"This is the Imperium, the government of our human race!
"The Imperium's capital is on Terra, its ruler is the God-Emperor, and its territory spans the entire Milky Way Galaxy. It possesses a million planets and is the true overlord of the universe!
"Sweet Star was also once a planet loyal to the God-Emperor. Of course, that was in the past."
Hearing this information, You He felt as if his brain had suffered a violent shock. He had never heard any of this before.
The T'au textbooks taught it this way: