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This design is the combination of syringe and medicine bottle,which reduce the application of the material.So it’s very environmental.The needle can’t be reused because the syringe can’t suck medicine again.This kind of syringe suitable for some poor country.Syringes and vials that were abandoned caused great pollution to the environment.In some poor areas,the reuse of needles have caused the outbreak of some infectious disease,such as AIDS.