| 摘要 |
The device has an elongated body (1) with a zone (2) easily manipulated by a student and a zone (3) easily manipulated by an instructor. The two zones are connected by articulation units (4) conferring relative freedom of movement between the student and the instructor. The body has two handles (7a, 7b), and the zone (3) includes handles (8a, 8b) to be hand held by the instructor. |
