West Virginia alone has had three major mining disasters in the last decade, all caused by explosions in coal mines.
在过去10年里，单西弗吉尼亚就发生过3次主要矿难，皆为煤矿爆炸引起。
West Virginia alone has had three major mining disasters in the last decade, all caused by explosions in coal mines.
在过去10年里，单西弗吉尼亚就发生过3次主要矿难，皆为煤矿爆炸引起。
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