The amount underground of return flow depends mainly on local natural conditions, such as the topography, land situation, while the slope has great impact influence on it.

地下回归水量主要取决于当地的自然条件，如地形，土地情况，其中坡度对地下回归水的影响最大。

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"Decisions about biofuels should take into consideration the food security situation but also the availability of land and water," Diouf said.

“有关生物燃料的决定应当考虑粮食安全形势，但也应考虑土地和水的供应量，”迪乌夫说。

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The situation is different in America if the gas lies under federal land.

在美国如果天然气埋藏在联邦所有的土地上，情况就不同了。

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Gary Solis, a law professor and retired Marine officer, says any mishandling of the situation can only land in the laps of officers.

NPR: Charges Expected Against Marines in Haditha Case

What we have to do is to make sure, number one, that they land in a decent rental situation or maybe a different house, provide them some help and counseling, and we're doing that, cooperating with state and local officials.

WHITEHOUSE: Town Hall Meeting on the Economy

What worries many people here is the prospect that the high-level political session of the talks, due to start late on Wednesday, will land ministers in an almost impossible situation.

BBC: Climate talks 'going backwards'