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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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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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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