共用针头注射毒品是艾滋病人数不断增加的主要缘由之一。用英语怎么说？

Drug needle-sharing is one of the main reasons for increasing AIDS virus infections.

One of the main reasons that the population of AIDS patient is on the increase is to share the needles to inject (drugs).

Needle-sharing inject drugs are a growing population of HIV/AIDS is one of the main reasons

syringes shared by intravenous drug use is an important blood-borne HIV risk behaviors

希望能帮到你，不是在线翻译之类的答案，本人英语水平可以信赖