Use farther with physical distance.
用farther来表示实际的有数值的距离

If you're thinking about more miles, more kilometres, more inches, more centimetres, etc., then you almost certainly want farther.
如果你想到的更多是多少英里,公里,英寸,厘米,等等,那么你几乎肯定要用farther
例:
Q: How much farther?
还要多远?
A: Four miles.
四英里
Use further with non-physical "distance" (i.e., figurative distance).
用further来表示非实际的“距离”,指抽象的距离

If you're not thinking about more miles etc. but more time, more effort (in fact, more anything that isn't distance), then you almost certainly want further.
如果你想到的跟数字单位那些距离都毫无关系,而是一些时间,付出等等,那么你肯定要用到的就是further。
Further is more diverse than farther. It covers all topics (even distance these days) and can mean furthermore, moreover, more, additional, extra and supplementary.
Further比farther更加多元化,包含了很多方面(现在也可以表示具体的距离),就和“而且;此外(furthermore, moreover, more, additional, extra and supplementary)”这些词一个意思。
例:
Do you have anything further to say?
你还有什么要说的吗?
They powdered it to prevent further harm.
他们给它抹上粉,防止进一步破坏。
总结:
1. farther
用于距离,表示更远。
2. further
一般用于抽象,但也可用于距离。

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