difficult of难以, 很难
difficultadj.困难的;艰难的;(人)难对付的;不易相处的
difficult to find job就业难
difficult caving roof难垮落顶板
difficult .dialogue艰难的对话
difficult confinement难产
difficult coefficient难度系数
difficult to get loan借款难
difficult degradation难降解
Difficult Enforcement执行难
difficult examination难答的试题
difficult of approachadj.难以接近的