He was too scared to go through with the operation.

go 是动词，意思是"去、进行"。 through 是介词，表示"通过、穿过"。 with 是介词，表示"和...一起、用..."。 go through with 是一个固定短语，意思是"完成、坚持做完（某事）"，通常指完成一件困难或不情愿的事情。