The syringe is composed of a syringe with a small hole at the front end and a matching piston core rod. Syringes are used to inject small amounts of liquid or gas into or out of areas inaccessible to other methods. When the core rod is pulled out, the liquid or gas is sucked in from the small hole at the front end of the needle cylinder, and when the core rod is pushed in, the liquid or gas is extruded.
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