sapper

"The political stability in the country allowed the students to focus on their studies. "

"The engineers designed a new water filtration system for the school. "

"Construction workers use explosives to break down large rocks. "

"He listened carefully to his mother's concerns, feeling sorrowful about her disappointment. "

"Yesterday our local garage employed a new mechanic."

"My teacher explained the new math formula specifically for students in the advanced class. "

"Construction is underway on the new bridge."

"to repair a house, a road, a shoe, or a ship"

"The medieval city's fortifications, including its high walls and deep moat, protected it from attack. "

"The foundation of his institute has been wrought with difficulty."

"We enjoyed a glass of fortified after dinner. "

"Inspect the system for leaks."