困难生 The difficulty lives ; Difficult students ; Problem students ; difficult life

鲁宾逊漂流记海难生存 Robinson Crusoe Shipwrecked

在最难生存的地方 among the hardest survive

生态灾难 ecological damage ; environmental disaster ; ecological disaster ; ecocatastrophe

家庭经济困难学生资助体系 system for giving students from poor families financial aid ; system for providing aid to students from poor families

难生物降解有机物 non biodegradable organic wastewater

困难残疾人生活补贴制度 living subsidy system for the financially-challenged disabled population

难生物降解 refractory to bildegradation

难生化污水 hard biodegradable wastewater

医生的两难选择 The Doctor's Dilemma