There are two kinds of sonar: passive and active. Passive sonar listens quietly for engine noise, or transient sounds such as a torpedo tube being opened.
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A man who killed three people during a 2023 knife attack in Nottingham had attempted to hand himself into MI5 for arrest two years earlier, an inquiry has heard.，更多细节参见搜狗输入法
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МИД России вызвал посла Нидерландов20:44