The Extra Key的意思|示意

A solution would be to place in the registry an extra-key for the machine's location.

一种解决方案是在注册表中放置一个额外键表示机器的位置。

I talked to your neighbor, they had an extra key, we saw the living room, they called the cops.

我跟你的邻居说了，他们有一把备用钥匙，我们看到了起居室，他们叫了警察。

When you create a table, you can add an extra column to be the surrogate key.

当创建一个表时，可以添加一个额外的列作为代理键。

So we had to advertise again to replace some key members of the team; we were lucky that we just about managed to cover the extra costs within the budget.

那么我们不得不再次做广告来替换几个团队成员，我们很幸运只是在预算范围内支出额外的费用。

Another key element of the design is a wooden amphitheatre located in the corner of the main dining area, which allows a place for children to play, events and extra seating.

设计中的另一个关键元素是位于主要就餐区角落里的木质阶梯状休闲区，这里是孩子们玩耍、竞技的好去处，也是额外设计的儿童座椅。

The key technologies is proposed, including methods of definition of mining topics, online acquirement of extra large amount of training samples, and algorithms of data mining with high performance.

提出了关键技术， 包括：挖掘主题的定义方法、海量训练样本的在线生成和高性能数据挖掘算法。