| 摘要 |
The device comprises a light guide for introducing light rays in its inside via its end, emitting said rays via its peripheral surface, a first semi-transparent casing for receiving the light guide hermetically in its inside and a second semi-transparent casing for receiving the first transparent casing hermetically in its inside. The second casing is located in the water for the purposes of projecting light outwards through the semi-transparent casing. <IMAGE>
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