speaking of which
01
そういえば, ちなみに
used to smoothly transition from one topic to another, often when the second topic is related to or follows naturally from the first
Collocation
例
I heard you 're planning a trip to Europe. Speaking of which, have you decided which cities you'll visit?
ヨーロッパへの旅行を計画していると聞きました。そういえば、どの都市を訪れるか決めましたか？
I was telling you about my favorite books, and speaking of which, have you read any good novels lately?
私は自分のお気に入りの本について話していましたが、ところで、最近何か良い小説を読みましたか？
