The article presents a simultaneous determination method for three kinds of water-soluble dyes: acid red, acid brown and acid black by solving simultaneous equations using a UV-VIS spectrophotometer.

介绍了利用解联立方程组的方法，在紫外可见分光光度计上实现了对酸性红、酸性棕和酸性黑的混合染料中三种成分浓度的同时测定。

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Unfortunately, these black smokers are very acid, which prevents amino-acid stabilization, and thus the formation of organic molecules.

但是因为上述黑烟囱都呈酸性，因此不利于氨基酸的稳定与有机分子的形成。

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For a classic look, pair a black jacket (like Sarah Jessica Parker's velvet number) with dark denim or a bright white tuxedo design (like Gwyneth Paltrow's) with a lighter or acid-washed pair.

经典的搭配是，黑色的外衣加深色的牛仔（如莎拉·杰西卡·帕克）或者亮白色的小礼服（例如）配更淡的裤子。

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We stopped in the afternoons to fish for a few minutes in little rivers turned black by the acid of cypress trees.

VOA: special.2010.01.30

Illinois-based company Renew Power has said it has already come up with a fuel cell compatible with mobile phones, by using formic acid, the chemical sprayed by black ants on the attack.

CNN: Search for better phone power

They're readying black wooden fume boards--hive lids lined in absorbent black felt on which they will drizzle butyric acid, the active ingredient in rancid butter.

FORBES: Magazine Article

Strip mines, mountaintop removal, polluted watersheds, Black Lung, mercury poisoning, airborne lead and other toxic pollutants, and acid rain.

FORBES: Coal Imports Bolster India's Private Ports