many of the ideas which people tell us have no foundation ha

many of the ideas which people tell us have no foundation have to do with mixtures of foods.这里的
many of the ideas which people tell us have no foundation have to do with mixtures of foods.
这里的怎么出现两个have 应该如何理解这种句型 如何翻译

句子分析：many of the ideas which people tell us have no foundation have to do with mixtures of foods.这是一个含有定语从句的复合句.其主句为：many of the ideas have to do with mixtures of foods.
定语从句： which people tell us have no foundation ,在定语从句中,People tell us是 插入语,可要可不要,去掉的话,定语从句的结构更加清晰,为： which have no foundation .所以该句的意思为：人们告诉我们,许多和食物混合料有关的想法是毫无根据的.