farther       
 adverb uk/ˈfɑː.ðər/ us/ˈfɑːr.ðɚ/
 更远;较远(far的比较级)
comparative of far : to a greater distance
  How much farther is it to the airport? 去机场还有多远? 
 The fog's so thick, I can't see farther than about ten metres. 雾太浓了,超过10米远的地方就看不见了。 
 farther       
adjective uk/ˈfɑː.ðər/ us/ˈfɑːr.ðɚ/
 更远的;较远的
a greater distance from something
  It was farther to the shop than I expected. 去商店的路程比我想象的远。