One of the more detestable euphemisms（主句的主语）// I have come across in recent years（修饰主句主语定语从句）// is（主句的系动词）// the term“Operation Sunshine”（主句的表语）,//（后面全部内容为“which引导的非限制性定语从句，which指代Operation Sunshine”） which（非限制性定语从句的主语）// is（非限制性定语从句系动词）// the name（非限制定定语从句表语）// (that/which定语从句间接宾语) the U.S. Government（定语从句主语）// gave （定语从句谓语动词）//to some experiments（定语从句状语）//(that/which定语从句宾语) it（定语从句主语） conducted（定语从句谓语动词）// with the hydrogen bomb（定语从句状语）// in the South Pacific（定语从句地点状语）.

which指代前面名词“Operation Sunshine” 并引导非限制性定语从句，并在非限制性定语从句作主语成分，it直到前面名词“U.S. Government ”

which is the name (引导定语从句关系代词that/which省略) the U.S. Government gave to some experiments (引导定语从句关系代词which/that省略) it conducted with the hydrogen bomb in the south Pacific。为非限制性定语从句修饰前面名词“Operation Sunshine”

备注：以上被限制性定语从句有包含2个定语从句，(1) (which/that) the U.S.Government gave to some experiments,关系代词that/which代替前面先行词“the name ”在定语从句作谓语动词gave的间接宾语，即give+ 间接宾语+直接宾语结构。(2)(that/which) it conducted with the hydrogen bomb in the south Pacific,关系代词that/which代替前面先行词“some experiments”在定语从句作谓语动词conducted宾语，即conduct A with B结构。

One of the more detestable euphemisms I have come across in recent years is the term“Operation Sunshine”, which is the name the U.S. Government gave to some experiments it conducted with the hydrogen bomb in the South Pacific.

(1)主句：One of the more detestable euphemisms I have come across in recent years is the term“Operation Sunshine”,

(2)从句：which is the name the U.S. Government gave to some experiments it conducted with the hydrogen bomb in the South Pacific.

主句语法结构分析如下

(1)主语：One（主语）// of the more detestable euphemisms(介词短语作后置定语修饰one)// I have come across in recent years（定语从句作后置定语修饰the more detestable euphemisms）

(2)系动词： is

(3)表语：the term“Operation Sunshine”,

从句语法结构分析如下

(1)主语：which（指代operation sunshine）

(2)系动词：is

(3)表语：the name （主语）//the U.S. Government gave to some experiments（定语从句修饰the name）// it conducted with the hydrogen bomb in the South Pacific（定语从句修饰experiments）.（备注：第2个定语从句中的it指代前面提到过的U.S.Government 美国政府、）