外键可以让您将一张表中的一行与另一张表中的一行相关起来。
Foreign keys allow you to relate a row in one table with a row in another.
外键是在一张表中出现的一个或多个数据属性；它可以是另一张表的键的一部分，或者干脆碰巧就是另一张表的键。
A foreign key is one or more data attributes that appear in one table that may be part of, or is coincidental with, the key of another table.
警察事先在复印机里放置了一张写着“他在撒谎”的纸张，每当他们认为嫌疑犯没说实话时，就按下“复印”键。
The message "He's lying" was placed in the copier, and police pressed the copy button each time they thought the suspect wasn't telling the truth.
与此类似，如果两张表通过一个外键连接起来，我们也称其为连接的。
Similarly if two tables are connected via a foreign key, they are connected.
在图10中有三张表，它们的键(oid)和外键用于在它们之间实现关系。
In Figure 10 you see three tables, their keys (OIDs), and the foreign keys used to implement the relationships between them.
他们要完成的任务就是在看见某张图片第二次出现时按下空格键。
The goal was to press the space bar on a keyboard whenever they saw a picture twice in a row.
吉他手理查德·汤普森把贝斯手戴夫·佩吉和鼓手戴夫·马特克斯一并带来，并仍担任第一张专辑的中演奏角色，同时约翰·卡尔提供了钢琴和金属键琴的演奏。
Reprising his role on the first album, guitarist Richard Thompson roped in bassist Dave Pegg and drummer Dave Mattacks, while John Cale provided both piano and celeste.
要实现一对一和一对多的关系，您只需要将一张表的键包括在另一张表中。
To implement one-to-one and one-to-many relationships you merely have to include the key of one table in the other table.
在GoogleReader的官方帮助页，有一张可用的快捷键列表供参考。
You can get a list of the available keyboard shortcuts from the Google Reader help page, but here are a few of my personal favorites that I use most frequently.
对于三菱印机，大概300张走纸能得到较稳定色样，那么在这三百张走纸过程中对于墨键的调整大概有多少次？
How about the Mitsubishi press, which took 300 copies to reach ok sheet, then how many times of ink key need to adjust in between these 300 impressions.
成长也就像一张在阳光下反射出五颜六色的唱片，按以下重拨键，便可以细听以往灌注的成长乐章，再次使我的心中泛起涟漪。
Growth in the sun like a colorful reflection of the records, according to the following redial button, they can listen to the past, the growth of reperfusion movement, again to make up my mind ripple.
成长也就像一张在阳光下反射出五颜六色的唱片，按以下重拨键，便可以细听以往灌注的成长乐章，再次使我的心中泛起涟漪。
Growth in the sun like a colorful reflection of the records, according to the following redial button, they can listen to the past, the growth of reperfusion movement, again to make up my mind ripple.
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