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.
一項官方審查發現，3月份關閉希斯洛機場的火災是由英國國家電網(National Grid)在7年前首次發現但未能修復的變電站問題引起的。
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