The model consists of four layers - DDL, DML, DPL and CL.该模型分为数据定义层DDL、 数据操纵层DML 、 数据显示层DPL和控制层CL四层, 这里重点阐述了DDL和DML层.Availability of database definition language ( DDL ) and database manipulation language ( DML ) in DAO ...
I left Texas and said good riddance to all that.我离开了得克萨斯州，总算摆脱了那里的一切。Texas has a long history of trade with Mexico.得克萨斯州与墨西哥的贸易往来历史悠久。He learned this song as an inmate at a Texas prison.他在得克萨斯监狱服刑时学会了这首歌。...
早在十七岁的小小年纪,我就离开了家.At the tender age of seventeen I left home.通常总共只有十一二个会员。现在将至少有十七个。Normally it has only had eleven or twelve members in all. Now it will have seventeen at the very least.现代派诗人就其许多想象又回到了十七世纪极抽象派诗人的意象诗中.Th...