nanoparticles

"We reserve the right to make modifications."

"Dust particles floated in the sunbeam coming through the window. "

"I put on sunscreen before going to the beach to protect my skin from sunburn. "

"Condoms are designed to protect against sexually-transmitted diseases."

"The air purifier helps remove ultrafine dust particles from the room, making it healthier to breathe. "

"The box contains my old toys. "

"The scientist studied the tiny particle of dust. "

"The virus is so small, it can only be measured in nanometers. "

"The diameter of the circular table is two meters. "

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

"The cleaning spray is an aerosol; it contains tiny liquid particles suspended in air. "

"We supply all microscopic stains and other materials."