Learn Farsi: بدنه‌ی فابریک تعویض‌شده هنوز خیلی گران است. - The replaced factory body is still very expensive.

This is a compound passive participle used as an adjective. The verb تعویض شدن means to be replaced. By taking the past stem of شدن and adding the participle suffix ه, we get شده. Attached to the noun تعویض, it creates the modifier تعویض‌شده (replaced). This allows us to describe the noun directly without needing a full relative clause.

Why is there an ezāfe between فابریک and تعویض‌شده?

The ezāfe links a noun phrase to further adjectives. The core noun phrase is بدنه‌ی فابریک (the factory body). To add our participle adjective تعویض‌شده (replaced) to this existing phrase, we must connect them with another ezāfe, resulting in بدنه‌ی فابریکِ تعویض‌شده.

Does the word فابریک just refer to any factory?

No, in everyday Persian it has a more specific meaning. Borrowed from French, فابریک is used primarily as an adjective to mean original, stock, or genuine. It is very common when talking about car parts or electronics to distinguish the original manufacturer components from aftermarket replacements.

How would this sentence look if we used a full relative clause instead of this reduced form?

Instead of just linking the participle with an ezāfe, you would use که (that) and a fully conjugated verb. It would become بدنه‌ی فابریکی که تعویض شده است هنوز خیلی گران است (The original body that has been replaced is still very expensive). The reduced participle form used in our sentence is much more concise and natural.