难以解决的 meaning in English

insoluble

Gasoline for the pyre is getting to be a real problem .
用于焚尸的汽油越来越成为一个难以解决的问题。
This common difficulty of the promotion process can scarcely ever be solved in the short run .
这种在晋升过程中常见到的难题，在短期内是难以解决的。
Only now did i recognize the challenge i had presented the old man, and realize how wonderfully he had met it .
到了这一刻，我才了解当年我给那位老人的是多么难以解决的问题，以及他把这个难题应付得多么得体。
But it also has some problems that can not be solved commendably
但是它也有一些难以解决的问题。
It is a problem difficult to work out
这是一道难以解决的问题

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