challenge名词形式
challenge既是名词也是动词;所以名词形式还是challenge
challenge
n.挑战;艰巨任务;挑战书,提议;质询;质疑;提出异议
v.对…怀疑(或质疑);拒绝接受;向(某人)挑战;
现在分词: challenging
过去式: challenged
过去分词: challenged
chools 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 president\'s authority.
这是对主席权威的直接质疑。
We need to challenge some of the basic assumptions of Western philosophy.
我们有必要向西方哲学的某些基本假设提出质疑。