If a nonnative plant species invades an above-ground community of flora and fauna, it can alter links between the native above-ground community and the below-ground soil community.

如果一种外来植物入侵了地上的动植物群落，就会改变地上群落和地下土壤群落之间的联系。

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It's then drained into a nearby water supply, like a river, or pumped into the ground, where it is reintroduced into the below-ground water supply.

此后水就排入附近的供水系统，例如河流，或者泵入地下，再进入地下供水管网。

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Our seamlessly integrated below-ground subway and above-ground bus mobile television advertising network enables our advertising clients to reach tens of millions of urban commuters daily.

我们对地下地铁和地上公交移动电视广告网络的无缝连接，能够让我们的广告客户每天覆盖数千万上班族。

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Over the last two decades, supercomputing allowed new skill levels in interpreting seismic data of below-ground structures.

FORBES: A Gold Mine In Oil Exploration

The new facility near Tongchang is far more advanced, with a 100-foot-tall launch tower and a below-ground tunnel to direct rocket exhaust.

WSJ: U.S. Warns North Korea Over Rocket Launch

The options for shelters are many: above-ground, below-ground, mounted in the garage, on the patio, on a poured slab or even in a space carved out beneath the slab.

CNN: A tornado's heading your way: Now what?