Traditional Culture Encyclopedia - Photography major - How do photographic photos present fluidity?

How do photographic photos present fluidity?

Fix the camera on a tripod, and set a small aperture such as below f 1 1 and a slow shutter such as 2 seconds or longer exposure time on the camera according to the scene light. All fixed objects (including stationary people) in the photo are clear, and all fast-moving objects are fuzzy and fluid.