a. impossible to hear; imperceptible by the ear
a. 听不见的
1. The teacher's voice was almost inaudible in the noisy classroom.
在嘈杂的教室里，老师的声音几乎听不见。
2. I had to lean in closer because her whispers were inaudible from a distance.
我不得不靠得更近，因为她的低语从远处听不见。
3. The sound of the rain was inaudible over the loud music.
在响亮的音乐声中，雨声听不见。