The fire that closed Heathrow airport in March was caused by problems at an electricity substation which National Grid first identified seven years ago but failed to fix, an official review has found.
一项官方审查发现，3月份关闭希思罗机场的火灾是由英国国家电网(National Grid)在7年前首次发现但未能修复的变电站问题引起的。
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