toroid

"Any two diameters of a circle intersect each other at the centre."

"The discussion generated an uproar."

"The science teacher conducted an experiment to demonstrate how plants grow in different types of soil. "

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

"Can you demonstrate the new tools for us?"

"The smooth surface of the kitchen table was perfect for setting the dinner plates. "

"He rotated in his chair to face me."

"The box containing my old toys was stored in the attic. "

"The discussion generated an uproar."

"My son rode his bicycle to school this morning. "

"Of course in my opinion Social Studies is more of a science than an art."

"a magnetic recorder"