His invention, indeed, is clearly associated with his attempts to make the deaf and dumb talk.

事实上，他的发明显然与他让聋哑人说话的尝试有关。

His father and grandfather had been teachers of the deaf and dumb and had made important researches in acoustics.

他的父亲和祖父曾是聋哑人的教师， 在声学方面做出了重要的研究。

This Spaniard is not deaf and dumb; you've let that slip without intending it; you can't cover that up now.

这个西班牙人既不聋也不哑；你无意中让它溜走了；你现在不能掩盖它。

Children with profound (greater than 90-decibel hearing loss) or total deafness fail to develop speech and have often been termed as deaf and mute or deaf and dumb.

严重失聪（大于 90 分贝听力损失）或全聋的儿童不能发展语言，经常被称为聋哑人。

Two influential citizens of Boston, Thomas Sanders and Gardiner G. Hubbard, had daughters who were deaf and dumb, and both engaged Bell's services as teacher.

波士顿的两位有影响力的市民托马斯·桑德斯 (Thomas Sanders) 和加德纳·G·哈伯德 (Gardiner G. Hubbard) 的女儿又聋又哑， 她们都在贝尔的学校任教。

'Yes, ' continued the pig-killer, as one accustomed to be heard. 'One that I knowed was deaf and dumb, and we couldn't make out what was the matter wi' the pig.

“是的，”杀猪人继续说道，就像他习惯听到的那样。 “我认识的一个又聋又哑，我们不知道这头猪是怎么回事。”