他敢于挑战困难英语可以用 "He is not afraid to take on difficult Engpsh challenges" 来表达。这句话的来源是英文中常用的表达方式，表示某人敢于面对困难挑战。
下面是一些英文例句及其中文翻译：
She is not afraid to take on difficult projects at work. (她不害怕在工作中接受困难的项目。)
He is not afraid to speak up and share his opinions, even in difficult situations. (他敢于表达自己的观点，即使在困难的情况下也是如此。)
They are not afraid to tackle difficult problems and find solutions. (他们不害怕处理困难的问题并找到解决方案。)
下面是一些英文例句及其中文翻译：
She is not afraid to take on difficult projects at work. (她不害怕在工作中接受困难的项目。)
He is not afraid to speak up and share his opinions, even in difficult situations. (他敢于表达自己的观点，即使在困难的情况下也是如此。)
They are not afraid to tackle difficult problems and find solutions. (他们不害怕处理困难的问题并找到解决方案。)