她不语，从她脸上掠过的一丝表情可知她是认得的。An expression of dumb recognition wiggled across her features.当气体中的自由电子被掠过的离子加速时,将发出辐射脉冲.Pulses of radiation are emitted when free electrons in the gas are accelerated by passing ions.建构一动态绘图:展示星状线...