Everyone wants to be happy， but many things happen in our lives to make us sad． 每个人都想快乐，但是生活中许多事让我们悲伤。
Our favourite pets can die， we can do poorly at school， close friends can move out of town．我们最喜爱的宠物死了，我们在学校成绩不好，亲密的朋友将搬离城镇。
When a loved one dies or when we deal with divorce or other serious difficulties in life， we all feel sad for a time， and grieving can help us work through the problem． 当爱人去世，生活中遇到离婚或其他重大的困难时，我们都会悲伤一段时间，忧伤可以帮我们度过这段困难时期。
Sadness is an important way to cope with loss or tragedy．悲伤是应对失败或灾难的重要方法。
There's a difference， though， between the “depression” that most of us talk about when we talk about feeling sad， and the kind of depression that's very serious and sometimes life —threatening．但是，我们大多数人在感到悲伤时所说的“抑郁”和那种非常严重有时甚至会威胁生命的“抑郁”是有差别的。
The depression that may threaten our life is also known as clinical depression．可能会威胁生命的抑郁也就是我们所知的临床上的抑郁症。
It is about feeling so sad and hopeless that you sometimes can't imagine being happy． It's about being miserable so much of the time that you don't feel like participating in life．它是指你感到极度悲伤绝望以至无法想象快乐，它是指你对生活感到痛苦以至不想继续活下去。
People who are chronically depressed usually have physical problems like stomachaches， headaches， and lack of energy．长期抑郁的人经常有胃痛、头痛和疲惫等生理上的疾病。
As you probably know， some people experience such deep depression that they believe suicide is the only way out of their pain． 正如你可能知道的，一些人极度抑郁以至相信自杀是使他们脱离痛苦的唯一办法。
