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
文法情報
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？
