Thustheyhave,intheirturn,becomethemostimportantanimalsontheplanet.请问句首的thustheyhave,为什么这么表达（从句法角度）

Question

Thus they have,in their turn,become the most important animals on the planet.请问句首的
thus they have,为什么这么表达（从句法角度）

Answer 1

这句话并不是你想的那样的,其实in their turn是插入语,Thus they have become the most important animals on the planet.这才是一句话~~have become是现在完成时~~
因此,他们在这个行星上成为最重要的动物~~in their turn只是插入语,用来强调