名词
中文翻译：硬边界
同义词：
['sound barrier', 'acoustic boundary']
例句：
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1. The sound of the waves crashing against the shore is a constant reminderof the sound-hard boundary between landand sea.
海浪拍打岸边的声音是陆地与海洋之间声学边界的持续提醒。
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2.The research team found that the sound-hard boundary could be breached by certaintypes of particles.
研究小组发现，某些类型的粒子能够突破声学边界。
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3. The sound-hard boundary plays a crucial role indetermining the propagation of sound waves.
声学边界在决定声波传播过程中起着至关重要的作用。