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by the way; in this connection; incidentally; in passing
ちなみに、私わたくしは猫ねこが好きすきです。
By the way, I like cats.
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、明日あすは雨あめが降るふるそうです。
Incidentally, it's supposed to rain tomorrow.