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золотое звено (перевод не буквальный, т.к. spike это костыль, однако наиболее близкий по смыслу и понятный англоговорящим: The term last spike has been used to refer to one driven at the usually ceremonial completion of any new railroad construction projects, particularly those in which construction is undertaken from two disparate origins towards a common meeting point.  wikipedia.org snowleopard) | |||