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 1. Everyday life scenario: Air pump needle
 
Commonly used for the inflatable tools of ball-related items, inflatable toys, air mattresses, etc., it can also refer to the specialized needle valve used to connect the air pump when inflating tires.
 
- Principle: Insert a slender needle body into the inflatable opening of an object, and press the air cylinder manually or connect an electric air pump to pressurize the air into the object's interior, causing it to expand and achieve the desired firmness/fullness.

- Features: Compact and portable, the needle body is compatible with different air inlet specifications (e.g., basketball air needle, bicycle tire air needle), simple operation, no specialized skills required.

- Example: When inflating a basketball, screw the needle onto the air pump, insert it into the basketball's valve, and press the pump to inflate; when inflating an air mattress, select the corresponding size needle to connect to an electric air pump, and quickly complete the inflation.