Where possible, reduce the use of "which," "who" "that" "whom" "whether... or not" etc.
　　少用关系代词
　　学会运用关系代词是你学习英文过程中的一个重要的阶段。学会少用它们则表明你取得了更大的进步。在校对你的作品时，仔细检查一下所有的which’s, who’s that’s和whom’s是否必要。删除不必要的关系代词会使你的文章更精彩。
　　 Example:
　　Unnecessary: It is a truth that is universally acknowledged that a single man in possession of a good fortune must be in want of a wife.
　　 (用两个 that’s，读起来很别扭)
　　Better: It is a truth universally acknowledged that a single man in possession of a good fortune must be in want of a wife.
　　-- Jane Austin
　　注：被动语态修饰的名词通常不须用关系代词。
　　Unnecessary: In 1970 India dedicated a nuclear power plant near Bombay, which was built with American assistance.
　　Improved: In 1970 India dedicated a nuclear power plant near Bombay, built with American assistance.
　　Unnecessary: During this period, Churchill spoke for a nation which was undivided and curiously happy, as it has never been in my lifetime, before or since.
　　Improved: During this period, Churchill spoke for a nation undivided and curiously happy, as it has never been in my lifetime, before or since.
　　Unnecessary: Justice theories have a long tradition, which goes back to Plato and Aristotle in the 5th century B.C.
　　Improved: Justice theories have a long tradition, going back to Plato and Aristotle in the 5th century B.C.
　　Unnecessary: Shirley Temple’s father blew nearly the entire $3 million that she made by tap dancing which made her famous in the movies.
　　Improved: Shirley Temple’s father blew nearly the entire $3 million she made tap dancing her way to fame in the movies.
　　Unnecessary: We told them they were the victims who deserved sympathy the most.
　　Improved: We told them they were the victims, most deserving of sympathy.
　　Unnecessary: Only a person who is oblivious* to the facts of modern life would doubt the need of vocational education today.
　　Better: Only a person oblivious to the facts of modern life would doubt the need of vocational education today.
　　Unnecessary: Not everyone in North America likes the taste of green tea, whether it contains caffeine or not.
　　Better: With or without caffeine, not everyone in North America likes the taste of green tea.
　　Unnecessary: Usually the Washington family married people who were socially better off than themselves, but the second marriage of George’s father was an exception.
　　Better: Usually the Washingtons married their social betters, but the second marriage of George’s father was an exception.
　　Unnecessary: In some instances, a letter can take ten days by air and six to eight weeks by ship to reach the person to whom the letter is addressed.