این تکه‌های متمایز را آنها تطبیق می‌دهند.

From Lesson 420:Object topicalization·Farsi

Questions & Answers about این تکه‌های متمایز را آنها تطبیق می‌دهند.

Why does the direct object این تکه‌های متمایز را come before the subject آنها in this sentence?
This is Object-Subject-Verb (OSV) fronting, which is used for topicalization. By putting این تکه‌های متمایز را at the very beginning of the clause, the speaker makes these distinct pieces the main topic or focus of the sentence, much like saying As for these distinct pieces, they match them up.
Since the object is moved to the front, do we still need the را marker?
Yes, absolutely. The word را marks a specific, definite direct object. Moving the object to the front of the sentence does not change its grammatical role, so را must still follow the entire noun phrase این تکه‌های متمایز to show that it is the receiver of the action.
Why is there an extra ی in the word تکه‌های?
The singular word for piece is تکه, which ends in a silent heh. It is made plural with ها to get تکه‌ها. Because ها ends in a long vowel, we must insert the consonant ی to act as a bridge before adding the ezafe vowel that links the noun to the adjective متمایز.
What is the core meaning of the compound verb تطبیق دادن?
It literally translates to giving adaptation or giving conformity. In everyday Farsi, it is a versatile verb used for matching things up, adapting to a situation, or comparing two sets of things to see if they align properly.
Could we drop the subject pronoun آنها since the verb ending ـند already tells us it means they?
Yes, you could drop آنها entirely and the sentence would remain grammatically perfect. However, keeping the explicit pronoun right after a fronted object often adds a slight contrastive emphasis, implying that these distinct pieces, they (specifically) are the ones matching them up.

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