听不清的声音用英语怎么说？

听不清的声音

a muffled sound

muffled

adj. （声音）被隔的，听不太清的，（衣服）裹严的，蒙住的；v. 压抑，捂住( muffle的过去式和过去分词 )，用厚厚的衣帽包着（自己）；

例句
His voice was pitched high, the words muffled by his crying...
他的声音很高，嘴里的话因哭泣而含混不清。

sound

n. 声音，声响，音调，声调，声波，嘈杂声；vi. 响，发声，听起来，好像，回响，[音乐]乐器等被奏响；vt. 使出声，使发声，清楚地发出，宣布，发表，颂扬；adj. 健全的，合理的，完好的，无损的，明智的；adv. 彻底地，充分地；

例句
Their sleep is regularly disturbed by the sound of gunfire as criminal gangs settle their nightly accounts.
他们经常被黑帮每晚火拼的枪声所吵醒。