for hundreds of years ,st.bernard dogs have saved the lives

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for hundreds of years ,st.bernard dogs have saved the lives of travellers crossing the dangerous pass.这句话中 for

从整句话的意思来看,for引的是完成时态,表示持续的状态.
如果不理解的话,你可以把for hundreds of years移到句末,也就是
st.bernard dogs have saved the lives of travellers crossing the dangerous pass for hundreds of years.这样我想你就好理解了.
而原句是想强调时间的长,才把其提前的.

for hundreds of years ,st.bernard dogs have saved the lives st.bernard dogs have saved the lives of travellers crossing 英语翻译：For hundreds of millions of years,turtles have struggle For hundreds Of years,scientists have been trying to answer 组句 have ,millions ,dogs ,people ,for ,kept ,of ,years . People have had pet dogs for thousands of years. 翻译 the dog have saved the lives of travellers crosing the dange For years,doctors____millions of patients' lives with the he people have kept dogs for millions of years 为什么用have kept The temple is said to have built hundreds of years ago. Dogs have been man's good friends for t______ of years.Many Dogs have been man`s friends for t＿ of years.Many stories to