Some greens worry that natural gas could hamper the development of renewable energy.

一些环保人士担心天然气的应用会阻碍可再生能源的研究。

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Some greens worry that natural gas could hamper the development of renewable energy.

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But if the FDA takes too hard a line on allowing in diagnostic test information, it could hamper the development of cancer drugs for years to come.

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Regional commanders, the illegal drugs trade and the continuing Taleban insurgency hamper the rule of law, development and aid efforts.

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