它的振动幅度取决于引力场的强度。Its oscillation depends on the strength of the gravitational field.振动幅度的大小决定声音的大小.The amplitude of the vibration determines the loudness of the sound.膜片振动,这使得周围的空气也动荡起来.The diaphragm vibrates , thus setti...
The competitors cantered into the arena to conclude the closing ceremony.选手们慢跑进入竞技场，为闭幕式画上了句号。They appeared on an edition of BBC2's Arena.他们在英国广播公司二台《竞技场》的一期节目中亮相。The arena was scarred by deep muddy ruts.赛场上留下了深深的车辙...
From these ports the grain is freighted down to Addis Ababa.粮食从这些港口运到亚的斯亚贝巴。He discloses, ababa and oneself individual character is very bashful that time.他透露, 当时奥巴马与自己的个性都非常害羞.That's endopening of Ethiopia's o...