Nearly all types of air purifiers include a particle filter. Some of those can be called "true HEPA" (high-efficiency particulate air) filters — meaning they conform to the standards set out by the DOE. Particle filters are made up of pleated masses of ultrafine fibers that force air to take a convoluted path in order to pass through. This traps and absorbs tiny molecules of smoke and dust, allergens like dander and pollen, and some viruses and bacteria.
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如果你经历过2021年的crypto，就会非常熟悉这种氛围：每个人都在build，每个人都有新idea，每个人都觉得自己正站在一个新世界的入口。