英語の和訳をお願いします。
Its construction covered four centuries, approximately 1800-1400 B C, for it was constantly altered to, and nowhere else is there anything like it: an outer ciecle of stones nearly fourteen feet high, pillars that support a continuous lintel, and within it a horseshoes of ten even huger stones, set in pairs, each pair with its separate lintel. An inner circle and inner horseshoe of smaller free standing bluestones repeat the pattern of the major members. These great blocks of sand-stone, or sarsens, some of them weighing fifty tons, were dragged more than twenty miles from the chalk downs, and the bluestones were somehow transported from the mountains of West Wales. They are not merely nutural blocks of ap-proximately the right size and shape, but each was carefully dressed to fit it for its function, and the ripples of the tool-ing, where they remain, are the most delicate detail of the building.Then, the uprights taper and curve towards the top, where tenons fit into the mortices of the lintels, which are carved to form an arc of the great circle. Moreover, the sides of the lintels of the horseshoe trilithons slope slightly out-wards to correct the illution of recession, the kind of refine-ment that makes the perfection of the Parthenon. These subtleties, indeed, suggest the influence of Greece of Myceean times, as do the recently discovered carvings of bronze axeheads and a dagger on one of the stones.
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参考になりました。