英语翻译```````````````英语翻译```````````````
英语翻译```````````````出自<<梦溪笔谈>>前文提到“取其中虚,附地枕之,数里内有人马声,则皆闻之.”兵土用皮革箭袋作枕时“虚能纳声”的空穴效应.