| 摘要 |
The device includes a rotatable float (1) and a pair of arms (20) joined to the central portion of the float and mounted symmetrically on either side thereof, as well as a pair of handle elements (31) which can each be grasped by a user (U1, U2) supported on one of the arms (20), whereby two users located opposite each other can impart a see-sawing motion to the device around the rotational axis (XX') thereof.
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