needle exchange
noun uk/ˈniː.dəl ɪksˌtʃeɪndʒ/ us/ˈniː.dəl ɪksˌtʃeɪndʒ/
[ C ] (UK also needle bank)（使用非法毒品的人可以把弄脏的旧针头换成干净的新针头的）针头换新处
a place where people who use illegal drugs can go to exchange their old, dirty, or used needles for new, clean ones
Needle exchanges provide clean and sterile equipment to promote safer injecting and reduce the spread of blood-borne viruses. 针头换新处提供干净消毒的设备，鼓励安全注射，减少病毒通过血液传播。
[ U ]针头换新（的举动）
the activity of exchanging needles in this way
a needle exchange service 针头换新服务