We are getting the message across to drug users that sharing needles is a high-risk behaviour.我们向吸毒者宣传，合用注射针头是很危险的做法。He had become infected with Aids from an improperly sterilised needle.他因使用消毒不当的注射针头而感染了艾滋病。Always sterilize the needle to prevent infection.注射针头每次都要消毒，以防感染。