In nature, microscopic objects generally refer to particles with a spatial scale of less than 10-6 cm and a mass of less than 10-15 grams, including molecules, atoms, atomic nuclei, elementary particles and other material levels. Microscopic particles and various phenomena in extremely small spaces. , Generally referred to as microscopic phenomena. Microscopic particles and microscopic phenomena are collectively referred to as the microscopic world. The motion of the microscopic world obeys the laws reflected by quantum mechanics and quantum electrodynamics.
The most accurate retelling of the main meaning of this passage is 'What is a micro phenomenon'.