box keelcenter line tunnelduct keelductkeel箱: chest; box; case; trunk形: form; shape龙骨: a bird's sternum fossil frag ...半箱形龙骨系统: semi-duct keel system槽形龙骨: channel-type keel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:箱形龙骨，即可在微信中查询翻译
