| 摘要 |
A device ( 1 ) which includes an elongate body ( 2 ) with a movable mass ( 3 ) arranged for sliding movement within the body ( 2 ), the element ( 4 ) being arranged to decelerate toward an end of the body ( 2 ) in order to impart forward movement thereto, via momentum transfer, and being arranged to accelerate away from said end in order to further drive the body ( 2 ) forward, again using momentum transfer.
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