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by the way; in this connection; incidentally; in passing
ちなみに彼女かのじょは留学りゅうがく中ちゅう。
By the way, she is studying abroad.
ちなみに彼かれは兄弟きょうだいがいません。
Incidentally, he has no siblings.
ちなみにこれは手作りてづくりですよ。
Incidentally, this is handmade.