1. 抑郁;沮丧;消沉
Depression is a mental state in which you are sad and feel that you cannot enjoy anything, because your situation is so difficult and unpleasant.
depression的反义词
e.g. Mr Thomas was suffering from depression...
托马斯先生患有抑郁症。
e.g. I slid into a depression and became morbidly fascinated with death.
我陷入消沉，开始对死亡有种病态的迷恋。
2. 萧条（期）；不景气
A depression is a time when there is very little economic activity, which causes a lot of unemployment and poverty.
e.g. He never forgot the hardships he witnessed during the Great Depression of the 1930s.
他永远不会忘记 20 世纪 30 年代经济大萧条时期他所亲眼目睹的困苦情形。
3. 凹陷;凹坑;洼地
A depression in a surface is an area which is lower than the parts surrounding it.
e.g. ...an area pockmarked by rain-filled depressions.
密布着雨水洼的地区
4. 低气压
A depression is a mass of air that has a low pressure and that often causes rain.