But it has limitation in complex formation drilling for its natural thermal instability and high sensitivity to salt contamination, whereas tannin could he modified to widen its using fields.

因其在使用中具有不耐温、不耐盐等较多缺陷，无法适用于特殊复杂的地层，但是通过对其改性，可以拓宽其应用范围。

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And, as for his hopes to develop bedsheets that can actually prevent chronic wounds, the hurdles are great too-especially given the many complex factors involved in the wounds' formation.

至于他研制能够真正预防慢性创伤的希望，困难还很大——特别是涉及创伤形成中的诸多复杂因素。

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In this paper, through the analysis of complex formation and leakage features of adjustment well in Zhongyuan Oilfield, the result shows that antileakage is key to drill successfully adjustment well.

中原油田地层情况复杂，漏失量大，通过对中原油田调整井地层复杂情况及漏失特点的分析，认为防漏是复杂区块调整井成功的关键，主要体现在防漏技术、配方、密度、流变性能、固控、起下钻措施等方面。

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LaPierre stood alone, looking angry and inflexible discussing a complex issue at an extremely delicate time in the formation of public opinion.

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One key element in searching for life on Mars is the presence of methane in the Martian atmosphere As a simple carbon compound, methane is often a precursor to the formation of the complex organic chemicals that make life possible.

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