57.there is no echo signal. But brightness, scanning line are still exists.
没有回波，但亮度，扫描均正常。
| 单词 | echo signals |
| 释义 |
echo signals
原声例句
航海英语听力 57.there is no echo signal. But brightness, scanning line are still exists. 没有回波，但亮度，扫描均正常。 航海英语听力 50.the echo signals are very weak, small targets can not be sighted. it is possible to say that magnetron is out of service 回波信号太弱，小目标看不到，可能是由于磁管老化。 航海英语听力 66.the echo signals are weak , the edges of the signals are unclear as well , the current of the magnetron is a little bit less than normal 回波弱，边缘也不清晰，磁控管电流略小于正常值。 TED演讲（视频版） 2020年3月合集 In that 40 hours that we are waiting to hear that echo signal here on the Earth, Voyager 1 has moved on by about 1.5 million miles. 在我们等待在地球上听到回声信号的那 40 个小时里，航海者一号已经移动了大约 150 万英里。 |
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