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README.md

@@ -536,16 +536,26 @@ Each scene includes a `caption.txt` file containing an English paragraph that de
 
 Each sequence includes a JSON file with the same name as the sequence. This file records the per-frame poses of selected dynamic objects, including their rotations and translations in the world coordinate system.
 
+<details>
+<summary><strong>JSON file structure</strong></summary>
+
 The JSON file contains two main parts:
 
 - `sequence_info`: basic information about the sequence, such as the total number of frames and the frame rate (`fps`).
 - `actors`: pose and metadata for dynamic objects, including object category, asset index path, actor type, and transformation data.
 
+</details>
+
+<details>
+<summary><strong>Actor-level pose storage</strong></summary>
+
 For each actor, the storage format depends on its `actor_type`:
 
 - If `actor_type` is `solid`, the object is treated as a single rigid body. Its per-frame pose is stored in the actor-level `transform_data` field, while the `components` field is empty.
 - If `actor_type` is `interactable`, the object is represented by multiple components. The actor-level `transform_data` field is empty, and the per-component poses are stored under `components[component_name].transform_data`.
 
+</details>
+
 <details>
 <summary><strong>Pose entry format in <code>transform_data</code></strong></summary>