that of :
1. 代替签名的某个内容
The size of China is bigger than that of USA. (that of = the size of )
2. 代指 “那一类”（that of = the size of )
His manner was that of someone accustomed to mixing with nobles.
(他的言行举止属于那种习惯于跟贵族打交道的人)
3. that 用于强调上文提到过的词或短语 表达的同类意思，that of ... 的意思是 “... 的同类的那种东西/事情”
that of 不能省略，否则后面的名词短语就成了前面名词短语的同位语，也就是前者是后者的具体解释，
二者不是同一组东西的不同说法，但是原文指的是前者是一种东西，而后者是与前者同类的另一种东西。
The effect was that of two guitars playing.
这样的效果是两架吉他在演奏。
Her novel was by far better than that of any other writer sin the city.
她的小说比那个城市的其他作家写的书好得多。
I said with a laugh that of course he had now found his man.
我笑着说这么说来现在他已经找到了他要找的人。
His lined face was that of an old man.
他布满皱纹的脸就像老人一样。
Their ruling passion is that of carnal love.
他们的主导激情源于肉欲之爱。
Its population is about triple that of Venice.
它的人口大约是威尼斯的三倍。
The body is that of a white male aged about 40.
尸体是一名40岁上下的白人男子
The central issue is that of widespread racism.
最重要的问题是种族主义的到处泛滥
The sound was not unlike that of birds singing.
这声音有点像鸟鸣
The plotline is similar to that of many other movies.
该主要情节与其他众多电影的主要情节相似
The critics compared his work to that of Martin Amis.
评论家把他的作品和马丁•埃米斯的相提并论
Her tone was that of a parent to a disobedient child.
她的声音听上去好像家长在教训不听话的小孩
This work is in austere counterpoint to that of Gaudi.
这件作品的质朴风格与高迪的形成了有趣的对比
Are you sure he was lying? I can't believe that of him.
你确信他在说谎吗？我不相信他会干这种事
He has positively identified the body as that of his wife.
他已确认那具尸体是他妻子的
The style Shelley is using here is that of popular lampoon.
这里雪莱用的是通俗的嘲讽手法
Some commentators compared his work to that of James Joyce.
一些评论员认为他的作品像詹姆士·乔伊斯的作品
My teaching style is similar to that of most other teachers.
我的教学风格和多数教师相似
The language of science overlaps with that of everyday life.
有些科学用语也用于日常生活
Modern music is often considered inferior to that of the past.
现代音乐常被认为不如过去的
Experts have authenticated the writing as that of Byron himself.
专家鉴定这字迹是拜伦的亲笔
The fertility of women who smoke is half that of nonsmoking women.
吸烟女士的生育能力是非吸烟女士的一半
The only sound is that of knives and forks scraping against china.
惟一的声音是刀叉刮擦瓷器的声音
Europe's foreign policy is inextricably linked with that of the US.
欧洲的对外政策和美国的紧密相扣
The school's approach must be complementary to that of the parents.
学校与家长的教育方法必须相辅相成
The timbre of the violin is far richer than that of the mouth organ.
小提琴的音色比口琴的音色丰富得多
The basic design of the car is very similar to that of earlier models.
这种汽车的基本设计与早期的样式非常相似
His version will later be cross-checked against that of the university.
他的说法稍后将被与大学的说法进行多方核对
Our road safety record compares favourably with that of other countries.
我们的道路安全纪录比其他国家的好
Farmers were supposed to get an income comparable to that of townspeople.
农民应该获得与城镇人相当的收入
The present position of the house coincides with that of an earlier dwelling.
这栋房子现在的位置恰与原住宅的位置一致
His rejection of our values is far more complete than that of D. H. Lawrence.
他对于我们价值观的摈弃远比D. H.劳伦斯更彻底
He has swapped his hectic rock star's lifestyle for that of a country gentleman.
他已放弃紧张忙碌的摇滚明星的生活，改做乡村绅士