Biocompatibility is the basic requirement for polymers used as medical device in clinic, and it's a crucial pathway changing surface chemical composition to improve the biocompatibility of polymers.

生物相容性是高分子材料在临床上用作医用装置的基本要求，改变高分子材料的表面化学组成是提高其生物相容性的重要途径。

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The influences of basic metal chemical composition, heat treatment conditions and welding parameters on the pressure vessel brittle fracture have been investigated.

研究了诸如化学成分、热处理条件和焊接因素对压力容器脆性破坏的影响。

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The composition, basic properties and chemical reactions of Turkish valonea extract were discussed.

论述了土耳其橡栲胶的组成、基本性质和改性过程中常用的几种化学反应。

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