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entrance (on the stage); appearance (in a book, film, etc.)
appearance (on the scene); arrival (on the market); emergence; introduction; advent
新しいキャラクターが物語の後半に登場する。
A new character appears in the second half of the story.
最新のスマホが市場に登場して話題になった。
The latest smartphone appeared on the market and became a topic.
彼女がステージに登場すると会場が盛り上がった。
The venue got excited when she appeared on stage.