an image of a structure that is produced by ultrasonography (reflections of high-frequency sound waves); used to observe fetal growth or to study bodily organs
双语例句
It also carries out surveys through two specially-designed vessels which are fitted with the latest type of equipment including multi-beam echo sounders. 该部配备两艘经过特别设计的测量船,船上装有最新类型的设备,包括多波束回声测深仪。