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位于英国爱丁堡的费兰蒂防御系统公司发展了大大增加水下能见范围的电视系统。这种系统对于有涡流的水文条件及直接光照不能使用的条件十分有用。
Ferranti Defense Systems, based in Edinburgh, UK, has developed television systems that greatly increase the underwater visibility. Such a system is useful for conditions that have eddy hydrology and direct lighting that can not be used.