常見例句雙語例句Some particles are focussing on the neutral region, which is caused by the drift under the action of an electric field along the neutral line.小擾動方法不能使用於中性線的區(qū)域內,在這個區(qū)域出現一個與小擾動漂移運動相反方曏的運動。 返回 focussing field