Two kinds of light-shield agents of ZnO and carbon black were used to improve the ageing-resistance of polyacetal(POM).
采用炭黑和氧化锌两种光屏蔽剂对共聚甲醛进行耐老化改性。
There are two other kinds of research that have thrown some light on the origins of the Native American population; they involve the study of teeth and of languages.
还有另外两种研究对印第安人的起源提供了一些线索；它们包括对牙齿和语言的研究。
As two kinds of types of journalism and literature, comment and essay all possess the short and small, light, flexible characteristic.
作为新闻学和文学领域的两种体裁，时评和杂文都具备短小、轻便、灵活的特点。
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