将纤维素物质转化为酒精和氢等生物能源，对解决人类目前所面临的能源短缺与环境污染等问题有重要意义。
The conversion of cellulosic biomass into bio-energy, such as ethanol and hydrogen, will decrease the requairment of fossil energy and improve the environment.
一方面，经济活动发生在一定的生态环境中，与生态环境进行着往复循环的能量与物质的转化，势必会引起生态环境的变动。
On the one hand, economic activities are bound to happen in a certain ecological environment. It will undoubtedly result in some changes in ecosystem.
亚硝酸盐存在于人类的唾液和某些特定食物保护剂中，它们能转化为致癌物质亚硝胺。亚硝胺主要在酸性环境中形成，例如胃酸条件下。
Nitrosamines are formed in acidic conditions, such as those afforded by stomach acid, but vitamin C inhibits their formation, by converting nitrite to nitric oxide.
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