Echo sounding, echolocation - figuring out the location of some thing by measuring time it's going to take for an echo to return from it the graphic of her was now firmly fixed in his mind → su imagen estaba ahora firmemente grabada en su mente Good Vocabulary: related terms https://truevintagenike86117.blazingblog.com/36564602/how-to-fix-microsoft-365-issues-on-windows-10-11