“纯净”可能只是相对的说法。2009年以前，联邦监管机构并未要求瓶装水去除大肠杆菌。
And "fresh" can be a relative term. Before 2009, federal regulators did not require water bottlers to remove E. coli.
在经过对植物体系进行酶相对数量的调整后，研究人员会在这些酵母中加入一种名为二甲基吗啡的混合化学物质，这样就会得到纯净的吗啡。
After tweaking the system to adjust the relative amounts of the enzymes, the researchers could feed their yeast a precursor chemical called thebaine, and get pure morphine in return.
而道教是汉族文化相对比较纯净的留存之处，道教中民族文化的因素就成了他最终入道的又一原因。
And Taoism the Han nationality culture relatively pure place of retention, Taoism national factor of culture became another reason that he takes part in Taoism finally.
反应可以生成纯净的氢气，可作为燃料电池的能源，还会生成氧化镁，一种相对无害的物质。
The reaction produces a pure form of hydrogen suitable for fuel cells, leaving behind only magnesium oxide, a relatively benign material, as a by-product.
不过，大量相对安全的食水还是好过少量绝对纯净的水。
Nevertheless, a large quantity of reasonably safe water is preferable to a smaller amount of very pure water.
不过，大量相对安全的食水还是好过少量绝对纯净的水。
Nevertheless, a large quantity of reasonably safe water is preferable to a smaller amount of very pure water.
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