The cheaper FNDs fluoresce roughly as well as those produced with an electron beam.此种廉价FND所发的荧光与用电子束生产的FND所发荧光大致相同.The radar beam can track a number of targets almost simultaneously.雷达波几乎可以同时追着多个目标.A high quality beam ha...
Visitors are shown an audio-visual presen-tation before touring the cellars.参观酒窖前，游客们先观看了有声的视频介绍。As the buildings rocked under heavy shell-fire, he took refuge in the cellars.当一座座楼房在猛烈的炮火中颤动摇晃时，他躲进了地下室。Some families stoc...