collar beam roofcollar-beam roof系: system; series梁: beam屋顶: roof; housetop系梁屋架: tie beam roof击梁屋顶: collar beam roof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:系梁屋顶,即可在微信中查询翻译