Backtrace technique
[计] 回溯技术
🧩 词语组成解析
[计] 回溯
🗣️ 情景例句
I was very sad indeed to hear about it.
听了这件事，我的确非常难过。
You are to blame.
你该受谴责。
and is still non-existent in a number of 'civilized' nations.
今天，在许多文明国家里，义务教育迄今尚未实行。