It takes many years to efface the unpleasant memories of a war.
许多年后才能冲淡战

愉快记忆。
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All right, as a quick recap, the nicotine in tobacco affects different neurotransmitters and neural systems in the brain, which produces effects that are initially pleasant or enjoyable, but can become more problematic and unpleasant if smoking continues over time.
得!快速回顾一下:烟草中的尼古丁对大脑中多种神经递质和神经系统产生影响,最初可以产生愉悦感和欣快感,但随着吸烟成瘾,吸烟会引发诸多健康问题以及不适感。