把导体看成是大量受迫阻尼振动的振子的集合.Envision the conductor as an assemblage of driven , damped oscillators.这个振子将获得能量.This oscillator will pick up energy.所有的振子都处于基态.All oscillators are in bottom state....
He's got a surface flow of suavity, but he's rough as a rasp underneath.他表面看来和和气气的, 其实是个粗野狂暴的恶棍.rasp with a file用锉子锉There was an ugly rasp in his voice.他说话时声音十分刺耳难听.Snow muffles the shriek of metal and the rasp...