以下为句子列表：
英文: It was also once said that the sound barrier would never be broken.
中文: 也有人说过，牢固的障碍是无法突破的。
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英文: This phrase is borrowed from the aeronautics flight testing industry of the 1950’s, when pilots flew increasingly faster, or “pushing the envelope”, eventually breaking through the sound barrier and further.
中文: 这一个片语从1950年代的航空学飞行测试业被借,当飞行员逐渐地更快速地飞了的时候,或推到极限,最后突破健全的障碍和比较远的。
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