紫胶恰巧还是一种有效的绝缘物.Shellac also happened to be an effective electrical insulator.把紫胶溶解在乙醇里形成的一种稀薄的清漆;通常作为面漆涂在木料上.A resinous secretion of the lac insect deposited on trees and used in making shellac.介绍了天然可食紫胶色素的组成 、 特性及提取技术等方...
He's a Princeton-educated Texan.他是受过普林斯顿大学教育的得克萨斯人。He liked to think of himself as a Texan.他喜欢以得克萨斯人自居.Andrew was surprised to see tears brimming in the burly Texan's eyes.安德鲁惊异地瞅见这个健壮的得克萨斯人两眼泪水盈眶....
他的车猛地撞到灯柱上,扯断了带电的电线,数千伏高压电流骤然通过车身。Thousands of volts surged through his car after he careered into a lamp post, ripping out live wires.如果存在γ粒子, 可能产生几千伏的电位差.If gamma particles are present, potential differences of several...