Teacher, may I ask why the variables inside the single quotes in this place can be parsed?

Question

Teacher, may I ask why the variables in single quotes in this place can be parsed?

Answer 1

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Answer 2

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Answer 3

Thanks boss, I have figured it out. This is two separate single quotes before and after, and the middle variable is not within the quotes.

Answer 4

I can’t see the single quotes in your picture