echo-sounding

n.回声测深

eavesdrop, eavesdropper, ebb, ebb tide, ebony, ebullience, ebullient, ebulliently, EC, eccentric, eccentrically, eccentricity, ecclesiastic, ecclesiastical, ecclesiastically, ECG, echelon, echo, echo-location, echo-sounder, Eckhard Hess, eclair, eclat, eclectic, eclectically, eclecticism, eclipse, eco-, ecological, ecologically, ecologist, ecology, Econ, economic, economical, economically, economics, economist, economize, economize, economise,