Loudness: A perceptual dimension of sound influenced by the amplitude of a sound wave; sound waves in large amplitudes are generally experienced as loud and those with small amplitudes as soft.
响度：声音的知觉维度，受声波振幅的影响，大振幅的声波通常被认为是响亮的，而小振幅的声波被认为是柔和的。
Lucid Dreaming: The theory that conscious awareness of dreaming is a learnable skill that enables dreams to control the direction and content of their dreams.
清醒梦境：一种认为梦的意识是可学习的技能的理论，它可以控制梦的方向和内容。
Magnetic Resonance Imaging (MRI): A technique for brain imaging that scans the brain using magnetic fields and radio waves.
磁共振成像（MRI）：一种利用磁场和无线电波扫描大脑的脑成像技术。
Major Depressive Disorder: A mood disorder characterized by intense feelings of depression over an extended time, without the manic high phase of bipolar depression.
重度抑郁症：一种情绪障碍，其特征是在一段时间内产生强烈的抑郁情绪，但没有双相抑郁症的狂躁高峰。