Police with riot gear and several fire engines are in attendance.防暴警察和数辆消防车都到了。He lived in considerable style, travelling widely, usually with a cook, valet, butler and chauffeur in attendance.他活得相当潇洒，通常带着厨师、用人、管家和司机到处游玩...
一弹钢琴那些玻璃饰物就会产生共振.Playing the piano sets up resonance in those glass ornaments.耳朵里有一组细丝能和进入的声波产生共振。The ear has a set of filaments to vibrate in resonance with incoming sound-waves.两个共振峰下面的面积是不相等的.The areas under the two r...