twin spar constructiontwin-spar constructiontwo-spar construction双: two; twin; both; dual梁结构: girder construction双梁结构设计方案: two-spar layout板梁结构: slab and girder单梁结构: construction; monospar; construction; single-spar; single spar construction; single spark structure; single-spar construction; single-spar structure下载手机词典可随时随地查词查翻译