四大挑战
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four serious challenges
四大严峻挑战
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Mr. Nishiyama, whose Ministry of Economy, Trade and Industry regulates Tepco, pointed out that the company has had serious challenges, including major quakes spaced less than four years apart.
WSJ: Japan Plant Had Troubled History
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