unoccupied section
空置的部分
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Mr Childs has revised the design to include an unoccupied section at the top, housing broadcast antennae and windmills - which he said could generate 20% of the building's energy.
BBC: NEWS | Americas | Freedom Tower plan for WTC site
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