challenge既是名词也是动词；所以名词形式还是challenge；challenge的形容词是challenging；
challenging：adj.具有挑战性的;挑战性的;考验能力的;挑起争论的;不赞同的。
challenge：n.挑战;艰巨任务;挑战书;邀请，提议;质询;质疑;提出异议。
扩展资料
Schools must meet the challenge of new technology.
学校必须迎接新技术的挑战。
The company faces major challenges over the course of the next few years.
这家公司今后几年将面临重大的挑战。
It was a direct challenge to the presidents authority.
这是对主席权威的直接质疑。
She does not like anyone challenging her authority.
她不喜欢任何人挑战她的`权威。
Building a home from scratch can be both exciting and challenging
建立一个全新的家庭既让人兴奋又富于挑战。
Im ready to do all those things which are more challenging.
我愿意接受更大的挑战。
