The minute particles act like urban smog or acid rain. They can penetrate deep into the human body.

这些微小颗粒像城市烟雾和酸雨一样，可以渗透到人体。

youdao

People who suffer from heartburn or acid reflux should avoid late, heavy meals that delay the emptying of the stomach.

患有烧心、胃酸过多毛病的人要尽量避免进食过晚或不好消化的食物，因为这样会延迟胃的排空时间 。

youdao

If good hygiene doesn't sweeten your breath, see your dentist and your doctor. Gum disease, dry mouth, or acid reflux could be part of the problem.

如果保持良好的健康习惯仍无法缓解你的口气状况时，找牙医和大夫看看，这种口臭可能是由牙龈疾病，口腔干燥，或胃反酸造成的。

youdao

One of the newly banned chemicals is perflurooctane sulfonic acid,or PFOS.

VOA: special.2009.06.23

So I show that here, so in green, you have what's called a carboxcylic acid group, a c o o h, which gets converted by s o c l 2 to a c double bond o c l or an acid chloride.

我在这里用绿色表示，我们所说的羧酸族化合物，碳，氧，氧，氢，它被亚硫酰氯转化为,一个碳氧双键与碳氯单键组成的酰氯。

麻省理工公开课 - 化学原理课程节选

They would naturally hybridize and form a duplex, or a double stranded nucleic acid.

它们会自然杂交并形成双螺旋,或者说双链核酸

耶鲁公开课 - 生物医学工程探索课程节选

Most garments should be folded in acid-free tissue in breathable fabric garment bags or acid-free cardboard archival boxes.

WSJ: Ask Teri: How to Keep Moths From Eating Sweaters

Frequent heartburn or acid reflux are symptoms of a condition called GERD, or gastroesophageal reflux disease, which occurs when a sphincter muscle in the lower esophagus stops working properly.

WSJ: New Surgical Option for Heartburn

However, it is also applicable in locations where smelter acid is not available by the purchase of sulfuric acid or the manufacture of sulfuric acid from sulfur or pyrite.

FORBES: Peak Copper: Worldwatch Institute Gets It Wrong Again