Why It's Unique: "This was the first tunnel goingunder a body of water, and it was the first time the shield tunnelingconcept was used, " Hashash tells PM.
独特之处：“ 这是第一条置于水中的隧道，也是第一次采用盾构隧道的概念，”哈沙什告诉大众机械的编辑。
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