In the first half of 2119, there were many online hot words, such as "Gao Jing, I'm sour, Lemon Jing, just thinking about youth, retired preparatory staff" and so on.

I often use the phrase "I'm sour". Whenever I encounter something in doubt, I will say "I'm sorry" first and then ask my own questions. Or sometimes when I see something enviable, I can't help but use "I'm sorry, I'm sour." I think these two words can accurately express my intention, and others will understand it at a glance. They can help me answer well and dispel my doubts. It is quite interesting to use.