There's a huge microbial biosphere hidden beneath the surface of the earth - possibly comparable in biomass to the plant life we can see on the surface.

地表之下存在着一个巨大的微生物圈——其生物量可能相当于我们在地表能看到的植物的生物量。

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Iran has already succeeded with laser enrichment in the lab, and nuclear experts worry that G.E. 's accomplishment might inspire Tehran to build a plant easily hidden from the world's eyes.

伊朗的激光浓缩实验已经获得成功，因此核专家担心通用电气公司的成就也许会鼓舞德黑兰建设容易遮人耳目的工厂。

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The drainage system in Qingxi Hydropower Plant originally adopted conventional relay control for its pump control system, which had many hidden troubles and resulted in multiple failures.

青溪水电厂排水系统的水泵控制系统原设计采用旧式常规电动机控制系统，投入运行后多次出现故障，存在许多安全隐患。

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In addition, Teitel was found guilty of targeting a prominent left-wing Israeli historian, Zeev Sternhell, with a pipe-bomb hidden in a plant outside his house in 2008.

BBC: File image of Jack Teitel (from 2009)

First, economic planners and bankers have to start accounting for the hidden cost of carbon in power plant feasibility studies on their own volition.

FORBES: Moving Beyond The Symbolism Of Earth Hour

The new manufacturing technique has been under development for two years and is still in a research facility, hidden among the grubby buildings of Pirelli's sprawling Bicocca plant on the outskirts of Milan.

ECONOMIST: Re-inventing the wheel