A sound that is audible is loud enough to be heard.
例句
The Co-lonel's voice was barely audible...上校微弱的声音几不可闻。There was an audible sigh of relief.听得出来松了一口气。
英汉词典释义
adj.
听得见的
The shot was clearly audible in the silence.寂靜中枪声听得很清楚。The noise was audible even above the roar of the engines.尽管有发动机的轰鸣声,这个噪音还是能够听到。The singer’s voice was just audible.那名歌手的声音刚刚能听见。