至于 (as for / when it comes to)

"As for…" — switching topic

• as for至于zhì yú + Topic = "as for / when it comes to (a new topic)".
• as for至于zhì yúprice价格jià gé，after以后yǐ hòuto say again再说zài shuō = "as for the price, we'll discuss it later."
• as for至于zhì yú shifts smoothly to a fresh sub-topic.

as for至于zhì yú + Topic，Comment

• as for至于zhì yú raises a new point and then comments on it.

as for至于zhì yúprice价格jià gé，later以后yǐ hòuagain再zàidiscuss说shuō。

• as for至于zhì yúprice价格jià gé，after以后yǐ hòuto say again再说zài shuō = "as for the price, later."

Recap

Read the full reference: HSK 5 grammar — Prepositions.