box section箱: chest; box; case; trunk形: form; shape剖面: bisect; section; profile箱形剖面床脚: box typed leg形剖面: i-section i; u-shaped core u; u-shaped coreu; u-shaped section u; u-shaped sectionu; v-shaped section; z-section z下载手机词典可随时随地查词查翻译