Everyday preposition/phrasal verb: be discouraged by

be discouraged by 因某事而感到沮喪
She was discouraged by his criticism.
她因他的批評而感到沮喪。

========
Our apps:

English Grammar - Phrasal Verb Lite version:

Lite version

English Grammar - Phrasal Verb Full version:

Full version

English Grammar - Preposition Lite version

Lite version

English Grammar - Preposition Full version

Full version