单语范例（未经PONS编辑处理）
Agriculture and fishing were the best developed resources, but only through years of painstaking investment and toil.
en.wikipedia.org The meticulousness of her work indicates a painstaking mind and an unusual degree of perfectionism in the craftsmanship of her poems.
en.wikipedia.org Changing tires at the time was a lengthy and painstaking process, as the wheels were not removable.
en.wikipedia.org His historical works embody the results of painstaking research and show analytical power.
en.wikipedia.org Before that, mathematics was written out in words, a painstaking process that limited mathematical discovery.
en.wikipedia.org