「哦，对了！」英文怎么说？

speaking of which 

说到这个……、谈到这个……、哦，对了……

We've been invited to Olivia's birthday party, speaking of which, don't forget the presents !

我们被邀请去参加Olivia的生日聚会，说到这个，别忘了礼物哦！

I'm as poor as a church mouse , speaking of which, my friend still owes me 100 yuan !

我已经穷到要吃土了，哦，对了！我的朋友还欠我一百元耶！

The intro

(Listening Comprehension)

Hey, what's up everybody ? It's Mr.Wong here. Winter is here and it's really cold out there, so remember to keep warm. Speaking of which, I need to shop for coats and jackets since my other jackets shrunk on me. Ahem, I've gained a few pounds during the holidays. Haha, how can you resist that juicy turkey, mashed potatoes, mac and cheese, pumpkin pie and all that other good stuff right ? It's my favorite time of the year. Alright, without furthur ado, let's jump right in to today's phrase of the day, which is..."speaking of which". Check it out !

没看懂？请自己查字典！

(这才是真正的学习过程)