Which is why it must be closed: for construction, as part of a plan to expand it.
这也是这条高速必须关闭的原因：为了建设——这是打算将其加宽的计划的一部分。
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And a World War II air raid shelter, where 4, 000 people were asphyxiated during a bombing, was closed until 2015 because of construction of the subway system.