求翻译：地基与基础工程专业承包贰级，建筑装修装饰工程专业承包贰级，园林古建筑工程专业承包贰级，市政公用工程施工总承包贰级，钢结构工程专业承包贰级，混凝土预制构件专业三级是什么意思？

Various ground and foundation engineering professional contract level, various architectural decoration engineering professional contract level, various landscape and architectural engineering professional contract level, municipal engineering General construction contract second grade, steel structure engineering professional contract level II, precast concrete professional levels