澳大利亚的两条公路隧道

The response reports the main dimensions, costs, terrain and lane totals, but gives the first construction period as 1986–1988 instead of 1986–1998. The overview and final sentence infer advanced building technology without visual evidence, while an opening date and matching bridge endpoints are also not established.

Ideas are organised logically into an overview followed by two body sections, with cohesive devices and referencing used naturally and without strain.

Vocabulary supports comparisons through expressions such as 'accommodate' and 'longer than the former tunnel'. Some choices reduce precision: 'river-spanning' obscures the tunnel's position beneath the river, 'went' is awkward for a fixed structure, and 'construction cost' would identify the expenditure more directly than 'price tag'.

A wide range of complex structures, including relative clauses and cleft-like emphasis ('it was not until 2006 that'), is used with consistent accuracy and only occasional slips.

The response compares costs, construction periods, lengths, ground materials and total lane counts effectively. The four- and six-lane totals match the cross-sections, but describing the vertical measurements as internal tunnel heights is not established by the diagram. The two-bores-per-system arrangement could be clearer.

Information is logically sequenced with a clear overview and well-managed referencing and linking devices, though organisation is at times somewhat mechanical and there is a minor punctuation lapse.

Vocabulary supports clear comparisons, including 'vehicle capacity' and 'substantially different'. However, 'for completion' is less idiomatic than 'to complete', and 'a body of water and sand' could distinguish the water from the ground layer more clearly.

A wide range of structures is used with strong control, including relative clauses, participle and appositive constructions, and accurate comparative forms, with only rare minor errors.