What is happening in Pakistan is likely to be a catastrophic concatenation of multiple factors.

巴基斯坦正在发生的事情很可能是多种因素的灾难性串联。

He himself, facing a firing squad, would not understand too well the concatenation of the series of subtle but irrevocable accidents that brought him to that point.

他自己，面对行刑队，不会太理解把他带到那个地步的一系列微妙但不可挽回的事故的串联。

For example, many programming languages have a string concatenation function, or " strcat" , which takes in two strings, and copies the second one to the end of the first.

例如，许多编程语言都有字符串连接函数或“strcat”，它接收两个字符串，并将第二个字符串复制到第一个字符串的末尾。