People who can neither hear nor speak (that is,deaf and dumb people) talk to each other with the help of their fingers.
问题描述：
People who can neither hear nor speak (that is,deaf and dumb people) talk to each other with the help of their fingers.
全句翻译,并作语法分析,to each other 做什么成分.
答
这里（that is,deaf and dumb people）是插入成分,对前面的进行解释说明,所以加了括号.完整的翻译：既听不到又不能说的人,也就是聋哑人,依靠他们的手指相互交流.People who can neither hear nor speak talk to each...each other 是什么短语each other 代词，意思是相互