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面向数据流的设计方法定义一些不同的映射方法，利用这些映射方法可以将______变换成软件结构。
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下面第(23)～(24)题基于以下说明：设有如下两个关系，若雇员的主键是雇员号，部门的主键是部门号。假设雇员表中的工资最低为800(包括800) ，最高不能超过2000。另外，这里假定DBMS不支持级联删除和级联更新功能。 雇员 雇员号 雇员号 部门号 工资 001 张山 02 2 000 010 王宏达 01 1 200 056 马林生 02 1 000 101 赵敏 04 1 500 部门 部门号 部门名 主任 01 业务部 李建 02 销售部 应伟东 03 服务部 周垠 04 财务部 陈力胜 若雇员号是主键，则在雇员表中，( ) 属性是外键。
系统分析通过了解企业的内外环境、企业的主体业务和业务流程，反映业务活动的数据及其结构以及对新系统进行效益分析，从而建立企业新的信息系统的______模型，即功能模型。
The city is said by the local people （） the chance to hold the 2012 Olympic Games.
I have an infatuation (迷恋) with autumn. The colors of the season, and the smells, have always thrilled me. I have always found joy in this time of year. The last few autumns of my life, however, I recollect in shades of gray rather than cheerful oranges and yellows. When I became a single mother, every aspect of life took on new meaning. Since I was used to carrying out most of the parental duties without much help during my marriage, I truly did not foresee how different parenting would become after the marriage was over. But suddenly I realized I was a statistic. The daily routine was not changed so much; it was the angle at which I had begun to look at life. I believed my ex-husband’’s lawyer was tracking every grade the children made, and I was under a microscope in this new town where the children and I moved our "broken home." I feared having to eventually establish my family with each new teacher and each new term as a single-parent family. I just wanted to be us again, without the stigma (特征) of the label that put on us. During those few gray years, I would reassure myself that soon things would be better, and that I would someday be able to feel whole again. There is no mathematical equation of adults proportioned to children to equal a stable, loving family. Every family has its strengths. In fact, studies show that in families who read together, eat together and communicate openly, children are likely to succeed academically, as well as socially and emotionally. I am sure these habits are just as effective when practiced in single-parent families. I realize now that I am not a statistic. We are an active, vital family in this charming community, where we are not marked by any stigma of any statistics of any focus groups. We are given opportunity, all of us. We are surrounded by beauty and immersed in possibility. There is joy to be found here, in what we see around us and in creating our own rendition of how we want to be seen. There is strength and grace in our own willingness to break free from conformity without falling behind the barriers of self-imposed limitations or preconceived notions of where we should fit in this world according to research. What does the last sentence of paragraph one imply
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