Metaphorical semantic extension takes place in the course of radiation, while metonymical semantic extension takes place in the course of concatenation.
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.
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.
方法中究竟采用哪一种,视若干相互联系的因素而
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学人 Science and technology 
，而通过转喻思维引起的词义延伸主要通过链接过程
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。
“strcat”，
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。
