| 单词 | sound barrier |
| 释义 | sound barrierˈsound ˌbarrier noun 1the sound barrier the sudden increase in the pressure of air against a vehicle, especially an aircraft, when it reaches the speed of sound: The world’s fastest car broke the sound barrier (=went faster than the speed of sound) during a test in Nevada yesterday.2[countable] a high wall that is built along the side of a road to block the noise of the traffic on the road |
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