1. Compound nouns: "Environmental quality" and "pollution control" are examples of compound nouns, which add specificity and technicality to the discussion, enhancing the lexical resource score.
2. Passive constructions: "are considered" in the phrase "are considered crucial" uses a passive construction, which is useful for formal and impersonal expressions, typical of written and spoken exams.
3. Adjective phrases: "Well-maintained" and "robust" serve as adjective phrases that modify nouns, adding depth and detail to the description of the infrastructure.
4. Relative clauses: The clause "that elevate the standard of living" is a relative clause that provides additional information about the recreational options, demonstrating the ability to use complex sentence structures effectively.