Then, an enzyme called ALDH converts the toxic acetaldehyde to non-toxic acetate.

接着，乙醛脱氢(ALDH) 有的乙醛转化为无的醋酸盐。

First, an enzyme called ADH turns alcohol into acetaldehyde, which is toxic.

首先，乙醇脱氢 (ADH) 酒精转化为有的乙醛。

If acetaldehyde sounds familiar that maybe because it's similar to formaldehyde. It's toxic. That's why it triggers the immune responds.

你可能得乙醇似曾相识，那是因为他和甲醛一样，有。这就是为什么我们的免疫系统会产生反应。

And the second quickly turns acetaldehyde into acetate, which is similar to vinegar and easy for the body to eliminate.

而第二时会快速地乙醛变成乙酸酯。乙酸酯的功能和醋很相似，可以轻易地从人体排出。

The body has an enzyme that breaks down acetaldehyde.

人体有一分解乙醛的。

Unfortunately, ethanol and toxic alcohol metabolites like acetaldehyde also pass freely through the placenta, but the fetal liver doesn’t have the necessary enzymes to metabolize them, so they build up inside the fetus really fast.

不幸的是，乙醇及有的酒精代谢产物，如乙醛，也可自由通过胎盘，而胎儿的肝脏却没有分解这些物质所必需的，因它们可以在胎儿体内快速积聚。