A lemon is an acid fruit.

柠檬是一种酸味水果。

youdao

The acid has burnt a hole in my jacket.

这种酸把我的上衣烧了一个窟窿。

《新英汉大辞典》

The acid test of a good driver is whether he or she remains calm in an emergency.

在紧急情况下能否保持冷静是对一个好司机的严峻考验。

《牛津词典》

Soil should also be tested for its pH level, a measure of the acid and alkaline balance.

VOA: special.2009.06.09

There are more than 20 amino acids that make up the biological polymers called proteins, so there are 20 choices of each amino acid at a position on a protein.

而那些称为蛋白质的生物活性多聚体,是由二十种不同氨基酸所构成,因此每个蛋白质的,任意位点都有多达二十种氨基酸可供选择

耶鲁公开课 - 生物医学工程探索课程节选

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

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

But stomach acid is a defense against bacteria, and a big new study found that acid suppression may have a surprising downside: more infections.

FORBES: On The Cover/Top Stories

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