stone bound
堆石界标 cairn
界石指标 landmark beacon
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他经过了一个曾经是一个烟囱的堆石界标，一个盖着生锈的马铁口板的枯井。井盖已经绣得更像是一个告警而不是在起到保护作用。
He passed a cairn of stones that once had been a chimney, a dry well covered with a slab of tin so rusty it served as more warning than safeguard.
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