| 摘要 |
This device represents a boat that is able to sail with its abacus-counter-shaped, empty and tightly-sealed wheels (2) with bearings in them assembled with a control stick (5) and a rotation axis fastened at the front part of body, and with abacus-counter-shaped, empty and tightly-sealed wheels (3 and 4) assembled with a cocentric axis and bearing, propelled by a screw (8) connected with motor. |
