wood used for bridges building桥梁: bridge; approach材: timber梁材: balk timber; balktimber; stringer承梁材: beam shelf; stringer横梁材: beam section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:桥梁材，即可在微信中查询翻译
