envelope in短语³³¹⁷⁰ 基本例句 被包围在…中 While some of the tests seem outlandish in hindsight, the military continues to push the envelope in seeking new warfare techniques based on cutting- edge science and technology. 而事后观之，其中一些测试其实非常古怪，非比寻常。军方持续推进这一进程，致力于找寻基于前沿科学技术的新型战争技术。 yeeyan