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。
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