There is a kind of false precision being hawked by people claiming they are doing ancestry testing.
问题描述：
There is a kind of false precision being hawked by people claiming they are doing ancestry testing.
There is a kind of false precision（there Be句型）being hawked by people（省略引导词的定语从句,现在一般式被动语态,修饰先行词precision） claiming （省略who的定语从句,）they are doing ancestry testing.（省略that的宾语从句）
这是一个关于基因检测的文章,按照书上的翻译,这句话的意思是：有人声称可以进行血统检测,但他们兜售的是虚假的准确性.
答
恩看了你的翻译我觉得翻译的蛮不错,你的语法句子分析都没错
There is a kind of false precision being hawked by people claiming they are doing ancestry testing.
那些声称进行血统测试的人们向众人兜售了一种（做基因测试）虚假的精确性.
也即他们达不到精度,但他们报出了虚假信息.
希望能有助于你的理解,你的那些观点和理解我全部看了，我同意你的解释，可以这样理解，我的分析如下：being hawkedby people做宾语补语部分，这种精确性是被people所兜售的跟随其后的claiming 这个是定语从句，其间省略了先行词who，补完全是 who had claimed ...claim 后面的是做claim的宾语部分，希望我的解释有助于你的理解