"What on earth is this?" Jim asked.
The burly man had also come over, and when he saw this machine, a look of surprise crossed his face.
"This is... a pollution detection device," the burly man said, "a tool used by the Pioneer Force in the past to check if they had been contaminated."
Carl was puzzled, "If it's just for detecting pollution, why is it so big?"
"Because detection is just one of its purposes," the burly man spoke in a deep voice. "Its more direct effect is to eliminate the pollution once it's detected."
"Eliminate the pollution?" Jim asked subconsciously, "How does it eliminate it?"
The burly man patted a recessed part on top of the machine, "See this here? This is where you put the Chainsaw Sword. Understand now?"
Some things didn't need to be spelled out explicitly.
