He has inaudibility to high-frequency sounds, so he didn't hear the alarm.

他对高频声音听不见，所以没听到警报声。

Her voice was too soft, causing the audience in the back to experience inaudibility.

她的声音太小，后排的观众听不见她说什么。

He couldn't hear the teacher's speech due to the inaudibility caused by his ear injury.

他因为耳朵受伤而听不见老师的讲话。