This exam is a acid test for me.

这次考试对我来说是一次严峻的考验。

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Vitamin a acid and antibiotic medicines are the main measures of Western medicine to cure the common acne. But it usually has the characteristics of great minus effects and high-rate of relapse.

现代医学通常运用维甲酸及抗生素类药物治疗本病，但普遍存在着副作用大、复发率高的缺点。

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To study normal white rat osteoporosis L4 vertebrae telescope viscoelasticity property caused by vitamin A acid, supply bioviscoelastic mechanics parameter with clinic.

研究正常大鼠椎骨和维甲酸所致大鼠骨质疏松L4椎骨的粘弹性性质，为临床提供生物粘弹性力学参数。

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In eighteen ninety-seven, a chemist named Felix Hoffmann at Friedrich Bayer and Company in Germany created acetyl salicylic acid.

VOA: special.2009.10.20

And then linked to the glycerol instead of a third fatty acid chain is a water soluble molecule, like a salt.

但连到甘油上的第三个基团不是脂肪酸链,而是一种水溶性的分子,像盐一样

耶鲁公开课 - 生物医学工程探索课程节选

They're derived from a precursor called triacylglyceride, which is as glycerol molecule with three fatty acid chains dangling off of it.

它们来源于一种叫三酰甘油的前体,由甘油分子上连接了,三个脂肪酸链构成

耶鲁公开课 - 生物医学工程探索课程节选

He searched for years and eventually lighted on a mixture of oleic acid (a fatty acid found in various vegetable oils) and nitrogen-containing compounds called amines.

ECONOMIST: To make engines cleaner, add H2O

The Lancet study compared cancer rates over a five-year period in 50, 000 people from several countries, some taking a folic acid supplement and some a placebo.

BBC: Folic acid 'cancer risk' fears played down by study

They began by finding a molecule that would carry a novel amino acid to a mammal cell's protein factories.

ECONOMIST: Synthetic biology: Expanded vocabulary | The