作者:admin 来源: 2015-3-26 15:39
[煎蛋小学堂]响屁不臭,臭屁不响么? 节目简介: 你是不是对日常生活中一些稀松平常的现象产生过好奇心? 到底为什么会是酱紫的呢? 科普类视频节目《煎蛋小学堂》几分钟为让你茅塞顿开,双语文本+视频+MP3更是不容错过的英语口语、口译好素材呢~~ 还在等什么,一起来一场对未知世界的奇妙探索之旅吧~~ 参考双语文本: You may have laughed at the idea of Silent but Deadly farts. But is this faint flatulence really more potent than the boisterous wind you let loose? Are silent farts actually worse? It may surprise you to find out that a large portion of farts are the result of swallowed air. Whether from chewing a lot of gum, drinking pop or simply from eating food, excess air enters your body and has to go somewhere.

And while some is released through burping, the rest ends up in the digestive system and eventually comes out your other end. But when expelled, this gas is made of mostly nitrogen, hydrogen and carbon dioxide, all of which are odorless. Which explains why some farts are obnoxiously loud, but contain little to no smell. The second half of the equation is gas from the large intestine. After travelling through 25 feet of small intestine, the indigestible portions of food make their way to the colon.

Here, millions of bacteria feast on the remaining food, and ferment it. And this is where things can get...stinky! Though the bacteria do release some useful vitamins, they also produce chemicals containing sulfur, which is responsible for the smell in flatulence. Add to that a sulfur rich diet with things like eggs, meat or broccoli, and you're likely to produce some interesting odors.

The longer these foods stay in the gut, the more they ferment and smell. Still, this smelly portion accounts for around only 1% of most farts. In the absence of the other odourless gases, however, these farts are concentrated with smell and generally quiet because there is less volume. Silent, but deadly! Having said that, loud gas can be just as smelly as the quiet ones, if the sulfur components are there.

Simply put, you loud farts likely contain a higher proportion airborne, odorless gases, whereas the quieter flatulence tends to have a higher proportion of the smell.
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