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| подводный объект (Off Gorleston, Norfolk, a dredger struck a submerged solid object 30 miles offshore, but when it went back using echo sounders, no object could be found; May 1975 (Janet & Colin Bord, "Unexplained Mysteries of The 20th Century") ART Vancouver) | |||
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submerged-object : 4 短语, 3 学科 |
| 一般 | 1 |
| 军队 | 2 |
| 航海 | 1 |