其根源可能是由于幼年环境，或是在晚年经历了痛苦而难忘的事件。

The roots of a depressive episode may lie in one's childhood environment, or in a traumatic event in later life.

youdao

其根源可能是由于幼年环境，或是在晚年经历了痛苦而难忘的事件。

The roots of a depressive episode may lie in one's childhood environment, or in a traumatic event in later life.

youdao