同样，另一种药会导致血压升高、加剧紧张、造成失眠，而且最终会上瘾，你就很难说它有什么好处。
It's also hard to find much right with a drug that elevates blood pressure, aggravates stress, causes insomnia and leads to addiction.
这种化学讯号被认为会触发动机，而且在反复后，终将会上瘾。
This chemical signal is thought to trigger motivation and, eventually with repetition, addiction.
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