@font-face{font-family:"Times New Roman";}@font-face{font-family:"宋体";}@font-face{font-family:"Calibri";}p.MsoNormal{mso-style-name:正文;mso-style-parent:"";margin:0pt;margin-bottom:.0001pt;mso-pagination:none;text-align:justify;text-justify:inter-ideograph;font-family:Calibri;mso-fareast-font-family:宋体;mso-bidi-font-family:'Times New Roman';font-size:10.5000pt;mso-font-kerning:1.0000pt;}p.15{mso-style-name:"List Paragraph";margin:0pt;margin-bottom:.0001pt;text-indent:21.0000pt;mso-char-indent-count:2.0000;mso-pagination:none;text-align:justify;text-justify:inter-ideograph;font-family:Calibri;mso-fareast-font-family:宋体;mso-bidi-font-family:'Times New Roman';font-size:10.5000pt;mso-font-kerning:1.0000pt;}span.msoIns{mso-style-type:export-only;mso-style-name:"";text-decoration:underline;text-underline:single;color:blue;}span.msoDel{mso-style-type:export-only;mso-style-name:"";text-decoration:line-through;color:red;}@page{mso-page-border-surround-header:no; mso-page-border-surround-footer:no;}@page Section0{margin-top:56.7000pt;margin-bottom:56.7000pt;margin-left:56.7000pt;margin-right:56.7000pt;size:595.3000pt 841.9000pt;layout-grid:15.6000pt;}div.Section0{page:Section0;} 因为在屋里说话的声波,通过墙周围传导声音,由于室内墙与墙对面传导声波相反,所以声波会在墙内产生抵消,或抵消一部分,这样使声波通过墙传导的声音,大部分被抵消,因此室外听不到室内声音。 而在外面说话,声音只有面向一面墙,只是一个方向的声波通过墙的传导,墙内就不存在相反方向的声波去抵消,所以这样在墙内不存在抵消现象,在屋里就能听见外面说话啦。 展开