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词汇 竖井
例句 In tin mining today, workers excavate tunnels horizontally from a vertical shaft.如今开采锡矿,工人们从竖井中横向开挖隧道。The workers go down to the tunnels through a vertical shaft sunk from the top of the cliff.工人们经过一个从悬崖顶部开掘的竖井进入隧道。
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