这些细菌实际上就是硫化氢和二氧化碳的结合体，而这种化学反应产生的有机物质是更大的有机体的食物。
These bacteria actually combine the hydrogen sulfide with the carbon dioxide and this chemical reaction is what produces organic material which is the food for larger organisms.
这是因为就分子而言，碳是一种很好的化学物的结合体。
That's because on a molecular level, carbon is a wonderful chemical joiner.
研究人员已经发明了精敏的新技术，来模拟化学药品，在紧密结合的沉默基因表达的DNA -蛋白复合体上做标记。
Researchers have devised clever new techniques to mimic the chemical marks on tightly wound DNA-protein complexes that silence gene expression.
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