It was generally believed that in a metal the valence electrons are easily detached from the individual atoms . 一般认为，在金属中价电子容易脱离个别原子。
Each stay is composed of 25-5/8 in diameter dywidag bars encased in a metal sheath . 每根拉索由25根直径为58英寸（16毫米）的迪威达格式粗钢筋组成，拉索套在金属套管内。
He supposed that some minimum amount of energy is required in order to pull an electron away from a metal surface . 他假设，某个最小的能量是为把一个电子拉出某种金属表面所必需的。
When a metal is brought into contact with an n-type semiconductor, electrons will flew from the semi-conductor to the metal . 使一块金属与n型半导体接触时，电子将从半导体流到金属。
During this crystallization minute grains of a metal such as iron have given flowed together to form a concentration . 在此结晶过程中，细小的金属（例如铁）颗粒汇流到一起就形成一个富集体。
In late 1978, the sony corporation of japan began marketing a system for digitally recording sound directly on a metal disk . 在1978年末，日本索尼公司开始出售一种用数字法直接在金属唱片上记录声音的系统。
For many years, the scientific standard of length was a metal bar kept in a temperature controlled vault near paris . 多年来，长度的科学标准曾是一根金属棒，这根金属棒保存在巴黎附近的有温度调节的地下室里。
A metal pin that joins two pieces of stone 轴头销把两块石头钉牢在一起的铁销钉
The machine should be protected by a metal housing 这个机器必须装一个金属壳。
Steal is a metal with the property of great strength 钢的性质是具有坚韧性。
