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The world's longest defense construction: the Great Wall.
世界上最长的防御建筑：长城。
youdao
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Active Defense; risk control; Human factors; Construction projects; Owners.
主动防范；控制风险；人为因素；项目建设；业主。
youdao
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Active Defense; risk control; Human factors; Construction projects; Owners.
主动防范；控制风险；人为因素；项目建设；业主。
youdao