Questions & Answers about zhè shì guōdǐ.
In 这是锅底, 这 means this as a pronoun all by itself: This is ...
So the structure is:
- 这 = this
- 是 = is
- 锅底 = pot bottom / soup base
When 这 directly modifies a noun, you usually need a measure word, for example:
- 这个锅底 = this pot bottom
But in 这是锅底, 这 is not directly modifying 锅底. It is the subject of the sentence, so no measure word is needed.