业务主键(自然主键):在数据库表中把具有业务逻辑含义的字段作为主键,称为“自然主键(Natural Key)”。 逻辑主键(代理主键):在数据库表中采用一个与当前表中逻辑信息无关的字段作为其主键,称为“代理主键”。
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By its sheer size, its richness and the abundance of its natural resources, Brazil is a key player in that area.
由于面积广大、多种多样和丰富的自然资源,巴西是该地区的一个重要参与者。
The oceans are a key part of the natural carbon cycle, in which carbon dioxide is circulated between the land, seas and atmosphere.
在自然的碳循环中,二氧化碳于陆地、海洋和大气中流通,海洋是其中一个关键的环节。
Technologies that enable natural user interaction are key to the success of mobile devices.
有助于用户自然互动的技术是移动设备成功的关键。
In the area of protection, UNICEF Senior Health Advisor, Anne Golaz,says the promotion of adequate nutrition, particularly breast feeding, is key to improving the child's natural defenses.
VOA: standard.2009.11.02
Now the natural alternative is to say, the key to being the same person is not the sameness of the soul, whether or not it exists, ! but rather having the very same--body!
现在还有一个理论认为,成为同一个人的关键,不在于是否有同样的灵魂,先不管灵魂是否存在,而是拥有同样的--肉体!
And the degree to which you can have experiences where you are being intimate with the natural world, is part of that sort of key to open the door to those transcended experiences and to the spiritual nature.
你会有一些与自然亲密接触的经历,你能从这些经历中感悟到多少,决定着,你能否打开通往超验和,神性的门。
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