The recent progress in research of polyacrylamide for thrice oil production is reviewed. The synthesis methods of temperature-resistant and salt-resistant polyacrylamide are emphatically described.

综述了三次采油领域用聚丙烯酰胺研究的最新进展，特别对耐温、耐盐型聚丙烯酰胺的合成进行了概述。

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At last the basic methods of PLL in frequency agile synthesis are discussed and illustrated. It has considerable reference value for the research of frequency agile synthesis.

最后讨论了PLL在捷变频率合成中的基本方法，并分别举例说明其特点，对捷变频率合成的研究有很高的参考价值。

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This review summarizes the recent progress in the research of fluoroporphyrins and its proper-ties. There are two methods for synthesis of the fluoroporphyrins: direct and indirect fluorination.

前言： 综述了近几年国内外含氟卟啉的合成及其研究进展。含氟卟啉合成方法分为直接氟化法和间接氟化法。 直接法主要采用无机氟化试剂直接对卟啉环进行氟化；

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Other companies are also in the business of making DNA for drug companies and other research organizations, which save time by using newer DNA synthesis methods instead of laboriously copying cells and inserting or deleting bits of genetic material.

FORBES: Magazine Article