This product becomes by a Laos red acid fine vulture.

该产品由老挝红酸枝精雕而成。

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Litmus paper turns red in the presence of an acid.

石蕊试纸遇到酸就变红。

《牛津词典》

Lots of bright red rods are seen, particularly in macrophages, in this acid fast stain of lymph node.

抗酸染色后，淋巴结内特别是巨噬细胞内可见大量亮红色杆菌。

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He says there is little evidence backing other popular energy additives, including the amino acid taurine in Red Bull.

FORBES: Magazine Article

It was not quite the sudden shift from litmus red to blue of an acid being neutralised by an alkali, but it was not far off.

ECONOMIST: Ecology raids the techniques of chemistry

Both breast-fed and formula-fed babies who had been given n-3 fatty acid enriched egg yolks had 30-40% greater red cell membrane DHA levels than those fed normal egg yolks.

BBC: Egg boost for babies