They have these special organs that collect the hydrogen sulfide and carbon dioxide and then transfer it to another organ, where billions of bacteria live.
他们有这些特殊的器官来收集硫化氢和二氧化碳，然后把它们转移到另一个器官，那里有数十亿的细菌。
The billions of bacteria and other microscopic critters that live in the mouth unquestionably influence the health of teeth and gums.
寄宿于口腔内的数十亿计的细菌和其他微生物无疑影响着牙齿和牙龈的健康。
People had been seriously studying ulcers for 50 years, billions of dollars were spent, and then-what do you know, it's a bacteria.
人们已经认真地研究胃溃疡50年了，花了几十亿的美元，而结果呢——它是一种细菌引起的。
There are billions of different types of bacteria in the caves.
这些洞穴里还有上亿种不同的细菌。
For billions of years, certain bacteria and fungi have produced chemical substances to protect them from attack from other microorganisms.
数十亿年以来，某些细菌和真菌通过产生化学物质来保护自己，抵御来自其它微生物的攻击。
Billions of years ago, free-living bacteria are thought to have become incorporated into living cells as energy-providing mitochondria.
据测在数十亿年前，一些自由生活的细菌进入到活细胞内部，变为负责提供能量的线粒体。
These may be primitive bacteria whose close relations are known to have thrived billions of years ago.
这些可能是原始的细菌，其近亲物种曾经在亿万年前繁荣过。
It is also explaining why the life forms that ruled the planet for billions of years and remain by far the most abundant - the bacteria - manage fine without it.
它也是为了揭示细菌这种无父无母的生命形式，为何能主宰地球数十亿年，而且至今还欣欣向荣。
These tiny bacteria and their billions of descendants, changed the destiny of our planet.
微小的细菌及其数以亿计的后代，改变了地球的命运。
The thinking behind this is that it is coming from the gut because alcohol changes the permeability of the intestinal wall and gram-negative bacteria live there in their billions.
背后的想法是这是从肠道中来的，因为酒精改变肠道的透气性和革兰氏阴性细菌以数十亿计的数量存在于肠道壁。
Lactic acid-producing bacteria play a key role in the production of fermented foods and beverages, accounting for tens of billions of dollars in sales annually.
乳酸菌在食品和饮料的发酵生产过程中起着重要的作用，每年可带来数百亿美元的市场销售额。
Lactic acid-producing bacteria play a key role in the production of fermented foods and beverages, accounting for tens of billions of dollars in sales annually.
乳酸菌在食品和饮料的发酵生产过程中起着重要的作用，每年可带来数百亿美元的市场销售额。
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