Action Editor(アクション)

While the Dope Sheet mode lets you work with keyframes of many objects at the same time, the Action Editor mode focuses on the keyframes inside a single action.

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Action Editor(アクション)。

An action is a reusable animation segment -- a collection of F-curves, where each curve describes how a certain property changes over time. Objects can reference one action as their active action and additional ones through Nonlinear Animation tracks.