This echo-location in bats is often compared with radar , the principle of which is similar .. 人们常把蝙蝠的这种回声定位与雷达相比较，因为它们的原理是相似的。
While the medical orderlies hurry by, and the echoes of the blast die away, he sets to work with efficient hands . 护理员打旁边匆匆忙忙地经过，爆炸的回声消失了，这时他用敏捷的手开始工作起来。
By measuring the time interval between the taps and the receipt of the echoes the depth of the sea at that point can be calculated . 通过测定叩击和收到回声之间的时间间隔，就能推算出该处海的深度。
It was almost an echo of the 1960s, when attempts to form a united states of europe were blocked by french president charles de gaulle . 这几乎是60年代的回声。那时有关形成欧洲合众国的种种企图遭到了法国总统戴高乐的反对。
It is now possible not only to locate a shoal but to tell if it is herring , cod , or other well-known fish , by the pattern of its echo . 不仅有可能测定鱼群的位置，而且可以根据鱼群回声的图象区分出鲱鱼，鳕鱼或其他人们所熟悉的鱼。
Nothing interrupted the stillness of the scene but the noise of the balls, which, whenever they were rolled, echoed along the mountain like rumbling peals of thunder . 只有球声不时打破眼前的寂静，每逢这些球滚动的时候，山中就会发出雷鸣似的隆隆的回声。
Echoes of cries of pain reverberate in my heart 痛苦呼喊的回声回荡在我的内心。
Echoes of cries of pain reverberate in my hear 痛苦呼喊的回声回荡在我的内心。
Don ' t expect anything original form an echo 不要期望从回声中找到独创的东西
General specification for active sonar of naval ship 舰艇用回声声呐通用规范
