“受难者”的英语可以翻译为：martyr，sufferer ...

我们同情水灾受难者.We are sympathetic with the flood sufferers.他帮助了受难者.He rendered assistance to the sufferers.全国人民都对特大洪水中受难者的家属深表同情.The whole nation feels with the families of those who were drowned in the great floods....