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
echo-gram的用法和樣例：
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. 該部配備兩艘經過特別設計的測量船，船上裝有最新類型的設備，包括多波束回聲測深儀。
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