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The vice topic is the subtitle or subheading. You know, like the secondary title you sometimes see after the colon in a book title. (Which, by the way, have you read WaniKani 2: Return of the Crabigator yet?)
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
昨晩、私の本にぴったりのすごくいい副題を思いついたの。
I came up with a killer subheading for my book last night.
ジェニーはカナエに記事の副題を変えた方がいいと提案しました。
Jenny suggested to Kanae that the subtitle of the article should be changed.
思い切って二つの副題を統合しちゃうのもアリかも.
A bold move might be to combine the two subtitles into one.
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