used to ask how great a distance is
[用以询问距离](离…)多远
- 
                                                
they wanted to know how far he could travel .他们想知道他能旅行多远。
 
to what extent
到何种程度,在多大程度上
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he was not sure how far she was committed. 他对她有多大热心没有把握。
 



















