Some people understand not to share needles, but then they'll get infected by sticking their own needle into an already contaminated "diluting cup" (a small plastic cup used for mixing powdered drug with a liquid injection medium to make injection easier).
有些人懂得不要共用針頭，卻因為把自己的針頭伸進了已受感染的稀釋器（塑膠小杯、用來將粉狀的毒品與注射液混合，方便注射）內而中獎。」