… 啊，… 啊 (casual listing)

"Apples, bananas, you name it"

• To reel off a casual list, tag (exclamation)啊a onto each item.
• apple苹果píng guǒ(exclamation)啊a，banana香蕉xiāng jiāo(exclamation)啊a = "apples, bananas, and so on."
• It's relaxed, spoken — softens the listing.

… (exclamation)啊a，… (exclamation)啊a

• (exclamation)啊a after each item gives an easy, open-ended list.

apples苹果píng guǒ啊a，bananas香蕉xiāng jiāo啊a，all都dōulike喜欢xǐ huan。

• apple苹果píng guǒ(exclamation)啊a，banana香蕉xiāng jiāo(exclamation)啊a，all / both都dōuto like喜欢xǐ huan = "apples, bananas — (I) like them all."

Recap

Read the full reference: HSK 5 grammar — Auxiliary words.