Inconsistency: refers to a kind of sick sentence with contradictory meanings expressed before and after the sentence, which makes the sentence unclear.

(Hint: See "can" and other words with two sides. See if it is consistent before and after. )

The contradiction between "many years ago" and "always" in this sentence can be changed to "I taught in Tsinghua University for many years"

You can refer to the answer order of this question:

Let's look at these examples:

1, I'm sure it may rain today.

Suggestions for revision: "affirmation" and "possibility" are contradictory.

I'm sure it will rain today.

There are many artistic treasures in China, and the exquisite murals in Mogao Grottoes are unique.

Suggestions for revision: "Many" and "Only" contradict each other.

There are many artistic treasures in China, and the exquisite murals in Mogao Grottoes are one of them.

It rained all day at noon today.

Suggestions for revision: "noon" and "one day" are contradictory.

Correct sentence: It rained all day today.