From the chemical composition, trace element, inoculation and thermal exchange of metal mold casting, the principle of chill formation and the effective methods for preventing chill were studied.
文章从铸铁的化学成分、微量元素、孕育处理及金属型的热交换方面叙述了产生白口的原理及防白口的有效方法。
Resonant laser ablation of metal is a very important experimental method, because it can be used as detection technique of trace element with high sensitivity.
金属样品的共振激光烧蚀可以作为一种高灵敏的痕量探测技术，近年来受到越来越广泛的重视。
Copper is an essential biological trace element, which is the most familiar metal in the daily life.
铜是日常生活中最常见的金属之一，也是一种非常重要的生命微量元素。
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