H2S is a highly toxic and highly corrosive gases. In recent years H2S has been found in some areas of Liaohe Oilfield, especially in heavy oil thermal recovery block.

硫化氢是一种剧毒和较强腐蚀性的气体，近年来在辽河油田一些地区相继出现，特别是稠油热采区块出现了较高浓度的硫化氢。

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Many are found in tropical and subtropical areas of the world, where the accumulation of high concentrations of metals may afford some protection against plant-eating insects and microbial pathogens.

许多超富集植物被发现于热带地区和亚热带地区，在那里，高浓度金属元素的积累可以为植物提供保护来对抗以植物为食的昆虫和细菌病原体。

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"We found some very significant and profound changes in their brain just at rest, particularly in the areas of the brain that help us to focus our mind and to focus our attention," he says.

他说到：“我们在他们休息期的大脑中发现了一些十分明显的而且具有深远意义的改变，特别是在帮助我们集中思想和注意力的大脑区域。”

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It found that in some areas parents had to pay for music lessons while they were free in others.

BBC: Gwent music service: Elitism fears over Newport plan

Previous CQC reports in May and November 2011 found failings in standards in some areas.

BBC: Ipswich Hospital 'now meets standards' - CQC

In the wild giant otters are found in remote areas within some freshwater lakes, rivers, creeks, and reservoirs of tropical South America.

BBC: The baby giant otters