一个删除操作可以从一个父表中删除一条记录，使得相关子表中的记录在父表中没有与之匹配的记录。
A delete operation could remove a record from a parent table, leaving records in an associated child table that no longer have a matching record in the parent table.
一个更新操作可改变父表中的一条记录，使得相关子表中的记录在父表中没有与之匹配的记录。
An update operation could change a record in a parent table, leaving records in an associated child table that no longer have a matching record in the parent table.
“明星转身”，米歇尔·奥巴马选择了一条长裙。26岁的设计师杰森-吴，照片中正审视他“春天之选”系列时装中的长裙。
STAR TURN Michelle Obama chose a gown by the designer Jason Wu, 26, here fitting a look from his spring collection.
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