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
To help scrub the building interior clean.
帮忙把建筑的内部擦洗干 。
A good lawyer,an evil neighbour.
好律师不是好邻居。
The terrible secret is called 'a skeleton in the cupboard'.
惊人的秘密称作“柜中骷髅”。