Sonar systems use sound, which travels faster and further through water than air.
У берегов популярного среди россиян курорта появились опасные медузы08:45
，详情可参考电影
Barry Esther/BBC，更多细节参见WPS官方版本下载
Amanda Silberling，这一点在快连官网中也有详细论述
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