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.
Surrogate keys are artificial keys that link dimension and fact tables and that are used to ensure uniqueness and to improve performance 代理键是链接维度表和事实数据表的假键，用于确保唯一性并提高性能。
