Is a constraint that enforces entity integrity for a specified column or columns by using a unique index 通过唯一索引对指定的一列或多列强制实体完整性的约束。
Shanghai used to be a “ paradise for adventurers ” , cut apart by the concessions of western powers 上海曾经是“冒险家的乐园” ，被西方列强的租界割裂得支离破碎。
It also looked like a 100 - 1 shot with their tender age and all the giants in the west 可是考虑到他们的年龄和列强林立的西部，那看上去同样像只会是100投1中的结局。
Then there ' s something entirely new with the western superpowers flattening out as they haven ' t in years 然后他们有一些新的方面可以压倒西部列强们，这是他们近几年都没有的。
Then there ' s something entirely new with the western superpowers flattening out as they haven ' t in years 然后球队就有一些新的方面可以压倒西部列强们，这是他们近几年都没有的。
In order to make for you to understand that every powerful country expand their armament , please look at stuff 3 师：为了帮助大家了解当时列强扩军备战情况，请大家看一个材料。
The central asia has been the place where many kinds of cultures communicate and many great powers compete since the ancient times 中亚地区自古以来便是各种文明交汇和列强逐鹿之所。
Equally horrifying was the death toll of ill - treated laborers in factories and mines run by imperialists across china 列强在中国各地开办的工程和矿山中，肆意虐杀华工的记录骇人听闻。
Before the end of the war , the major powers had taken steps to set up a new international body to replace the league of nations 在战争结束以前，列强就已经有所行动，建立新国际体制，以取代国际联盟。
