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.
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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