碱金属原子的价原子具有两种能态.The valence atom of an alkali - metal atom has two states.所有的碱金属都在闭合壳层之外有一单个S电子.All the alkali metals have a single s - electron outside a closed shell.当碱金属光谱显示出不容怀疑的双线结构时,是令人惊奇的.It was surprising when th...
这个球是由一种天然纤维——省藤制成的。The ball is made of rattan — a natural fibre.我用完善后的技术摘掉了纤维瘤。I removed the fibroid tumours, using the techniques that I have perfected.全麦面包纤维含量比白面包高。There is more fibre in wholemeal bread than in white ...
Similarly the positively charged proton has a negatively charged antiparticle, the antiproton.同样的,带正电荷的质子具有其带负电荷的反粒子—即反质子.This sister particle is usually called an antiparticle.姐妹粒子通常称为反粒子.This property, often called " h...