invariant

"The transformation of the classroom from a noisy space to a quiet learning environment was remarkable. "

"He is a student of life."

"The new policy, surprisingly, unaffected the students' daily routines. "

"The constant noise from the construction site made it hard to concentrate on my homework. "

"The specified dress code for the party included a formal gown and black tie. "

"My sister is very helpful, especially when it comes to organizing things. "

"The function of a school lunch is to provide students with nutrition. "

"Because calculating the covariant for higher-degree polynomials is computationally intensive, researchers often rely on specialized software to find them efficiently. "

"You have to choose between quantity and quality."

"Regardless of the rain, she went to school. "

"The operation of the new coffee machine is quite simple. "

"Most impartial observers agreed that Sampras had not served well."