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1.The pit border is a natural barrier that separates the forest from the river.
坑边是一道自然的屏障，将森林与河流分隔开来。
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2. The workers carefully removed the debris from the pit border to prevent further damage.
工人们小心翼翼地从坑边清除了碎片，以防止进一步的损害。
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3. The pit border was a crucial part of the construction project, as it protected the workers from falling rocks.
坑边是施工项目的关键部分，因为它保护工人免受落石的伤害。