Most limestone and sandstone aquifers are deep and extensive, but may contain groundwaters that are not being recharged.

大多数石灰岩和砂岩的蓄水层很深并且规模很大，但是它们含有的地下水可能是当前无法再生的。

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Most limestone and sandstone aquifers are deep and extensive but may contain groundwaters that are not being recharged.

大部分的石灰岩和砂岩的蓄水层都是深而广的，但可能含有不可再生的地下水。

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Extensive reading is not reading word for word but finding out the main ideas of the passage.

泛读并非逐字逐句地阅读，而是找出文章的主要意思。

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Eric Anderson, president and CEO of Space Adventures, the company sending Garriott into space, told CNN the training program is extensive, but does not exclude people from making the flight.

CNN: Training for civilian space travel is no picnic, Garriott says

Gates served in the Air Force during the Vietnam era, but does not have extensive military experience.

NPR: What to Expect from a Gates Pentagon

But there has not been extensive planning for the next year.

WHITEHOUSE: Press Briefing