kè zhōu qiú jiàn

Explanation:

Metaphor is not understanding that things have developed and changed, but still looking at problems statically.

Source:

Lu Chunqiu Chajin: "Some Chu people waded in the river, and their swords fell into the water from the boat, so they agreed with their boat and said,' My sword fell from there.' The ship stopped at its destination, and the man of the state of Chu jumped from the place where he carved the mark to the water to find the sword. The boat has done, but the sword can't. If you ask for a sword, isn't it confusing? "

Example:

If you get to the bottom of it like this, it is ~, the rubber column is drumming! (Qing Cao Xueqin's "Dream of Red Mansions" back to the 120th)