It is difficult to 那很难 ; 很难受 ; 做某事 ; 真难
It is difficult to understand 难以释怀 ; 很难懂 ; 难以理解
It is difficult to discern 很难看 ; 很难看吧 ; 很难看吗
It is difficult to find 难以找到
It is difficult to learn 很难学
It is difficult to match 难以匹配
It is difficult to grasp 很难掌握
It is difficult to accept 难以接受
It is difficult to master 很难掌握
It is difficult to make oneself concentrate for long periods.
让自己长时间聚精会神是很困难的。
《牛津词典》
It is difficult to separate legend from truth.
传说与事实很难分辨。
《柯林斯英汉双解大词典》
It is difficult to define what makes him so popular.
很难解释清楚什么原因使他如此走红。
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