depression

经济危机导致了一场长期的萧条。

The economic crisis led to a prolonged ___depression.

1930年代的全球萧条造成了毁灭性影响。

The global ___depression of the 1930s had devastating effects.

众所周知，定期锻炼对控制轻度抑郁症有效。

Regular exercise is known to be effective in managing mild ___depression.