键: 名词1.[机械工程] (使轴与齿轮、皮带轮等连接并固定在一起的零件) key 短语和例子轴键 shaft key2.[书面语] (插门的金属棍子) bolt (of a door)3.(琴、打字机或其他机器上, 使用时按动的部分) key (of a typewriter, piano, etc.) 短语和例子按钢琴的键 press the keys of a piano;
Example Sentences:
1.
Key defining the target of this step was to reform relationships between entities , and to define the primary key and foreign key for every entity ; 4 （ 3 ）定义键本阶段的目标是改善实体联系，为每个实体定义主键，迁移主键以建立外键。
