cutting-down line内: inner; inside; within龙骨: a bird's sternum fossil frag ...底部: bottom; bottom side; foot; r ...曲线: curve; curved line内龙骨: bilge keelson; inner flat keel; inner keel; innerkeel; kelson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:内龙骨底部曲线，即可在微信中查询翻译
