For Analogy, try getting into a car. It'll be silent with the windows rolled up and the doors shut. But still one is able to hear the important warning sounds like horns from other vehicles.
To understand just try to make out the difference the sounds while driving / riding in a car with the windows rolled down Vs. driving / riding in a car with the windows rolled up.
Similarly ear plus filters out the stressful / unwanted noises and lets you hear the meaningful sounds.





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