This operation is called concatenation .

这项操作成为连接。

It was cause by an improbable concatenation of circumstances .

这是由奇异的事件的连接造成的.

The arab revolt of 2011 belongs to a rare class of historical events : a concatenation of political upheavals , one detonating the other , across an entire region of the world .

2011年的阿拉伯起义属于一类罕见的历史事件：政治剧变的串联，这些动乱相互引爆，遍及一整个世界性的区域。

A warm , sunny day at a particular time and place , as desirable as it may be to human beings , is not a good as long as we are unable to control the natural forces whose concatenation produces it .

温暖，阳光明媚的一天，特定时间和特定地点，虽然是人们想要的，并不是商品因为我们不能控制产生它的自然力量。

In the following example , name is an identifier that holds a concatenation of the student 's first and last names .

在下面的示例中，name是保存学生姓和名的串联的标识符。