他把注射器放到水中煮，把刀子放在火上烧来进行消毒。
He boiled his syringe and fired his knife to sterilize them.
如果注射器没有消毒而被重复使用，可能会造成疾病的传播。
If syringes are reused without sterilisation, they can spread disease.
在全世界，高达40%的感染是由不经消毒重复使用的注射器和针头引起的。在有的国家，这一比例竟高达70%。
Worldwide, up to 40% of injections are given with syringes and needles reused without sterilization and in some countries this proportion is as high as 70%.
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