Intrusion into natural areas by port expansion and maintenance can pose serious threats to wildlife and sensitive species and habitats.

闯入自然生态区域进行港口扩建和维护，均会对野生动物和敏感类生物以及植物生态环境造成严重的威胁。

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It basically means that even developed landscapes can contribute to the overall ability of a region to support sensitive species that lived there before development occurred.

它的基本含义是，景观即便被开发了，也仍然能够提高某一地区保护开发前曾在此地出现过的敏感物种的整体能力。

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In all 17 species, the commonest kind of light receptors were "rod" cells, which are highly sensitive to light and allow night vision but cannot tell colors apart, they found.

在所有17种鲨鱼中，最常见的感光细胞是“杆状”细胞，这种细胞对光线非常敏感，可以使鲨鱼具有夜视能力，但这种细胞无法分辨颜色。

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They are told how sensitive each species is to pollution, and asked to work out from this how polluted the pond is.

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Some exceptional species are sensitive to ultrasound, while others such as the European eel, a freshwater species that spawns at sea, are sensitive to infrasound.

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"We are committed to managing sensitive sites for the benefit of biodiversity and the conservation of priority species and habitats, " a spokesman said.

BBC: Wales