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Use "submicron" in a sentence
"And it is essentially the inhalation of submicron particles of dust that adhere to the lungs and create an inability of the lungs to exchange oxygen."
"Treiman later told me: “Would any reasonable person conclude that there was life on Mars based on the proportion of magnesium in submicron grains of magnetite?”"
"I look at very small submicron-size particles, 1/1000 the size of a grain of sand, located in the more diffuse regions of space where stars aren't forming."