词汇	second pendulum clock
释义	second pendulum clock 秒摆时钟
随便看	the background of globalization The Background of Taoist Ci the background of the buddhist culture The background of the task the background of wishing well the backing city the backing of a carpet The backing region the backing vibration isolation system the back issue external loan The back line at each end of a tennis court the back of the back of a book the back of a couch the back of a hand the back of a horse The back of a horse the back of a knife the back of an envelope theback of beyond the back of beyond the back offensive the back of hand the back of his leg The back of name card