＃老師無法正經教英文，在此謹重跟各位道歉＃
墜入深淵；心情down到谷底：
Sb fall into the depths of despair .
Sb fall into the abyss of despair .
I fell into the depths of despair when I was demoted.
當我被貶職時，我的心情down到谷底。
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