Challenge-response
挑战-应答
🧩 词语组成解析
challenge
['tʃælɪndʒ]
n. 挑战;盘问;质疑;怀疑;
vt. 质疑;向…挑战;
vi. 提出挑战，要求竞赛（或竞争）;驳斥;
🗣️ 情景例句
There is not a shadow of a doubt that they did it.
毫无疑问，是他们干的。
What a fabulous kid!
多出色的孩子。
Which part of England do you come from?
你从英国的什么地方来？