I'm Working on the Industrial Revolution in the Goblin Tribe

Lin Yuan, a 28-year-old engineer, traveled through time and became the skinny green-skinned bastard in the goblin tribe. The tribe is on the verge of extinction, the tribesmen are as skinny as firewood, and the enemies are watching. Fortunately, he had the entire set of "One Hundred Thousand Whys" in his head. Others drilled wood to make fire, but he directly set up a blast furnace to make steel. Others used stone axes to chop each other, but he had already drawn the trigonometric function lines that trapped the horse pit. When the holy war coalition forces of the Holy See came to the city and wanted to crush these "devil's creations" with their iron hooves, Lin Yuan stood on the newly assembled hot air balloon and waved to the dense phalanx below: "Brothers, let them see -" "What is a dimensionality reduction strike?"