There are many kinds of drug users.

吸毒者有很多种。

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We use "bad habits" the way drug users use drugs.

我们对待坏习惯就好似瘾君子对待毒品。

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The intravenous drug users are at high risk for TTV infection.

静脉毒瘾者是TTV感染的高危人群；

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The intravenous drug users are at high risk for TTV infection.

静脉毒瘾者是TTV感染的高危人群；

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