acoustic shadowacoustical shadeacoustical shadowsound shadow regionsound shadow zone声影: sound shadow; acoustic shado ...区: H region; H有效声影区: effective shadow zone声影: [物理学] sound shadow; acoustic shadow声影区指声线不能到达的区域: sound shadow region下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:声影区，即可在微信中查询翻译
