sonic line声速: acoustic velocity; acoustic ...线: thread; string; wire声速: acoustic velocity; acoustic speed; [物理学] sound velocity; sonic velocity变速线: shift cables测速线: measured mile course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:声速线，即可在微信中查询翻译
