Who's who ^{谁是谁（名字、职务等）?}

• You'll soon get to know who's who in the company.
• Who's who ^{英国的《名人录》}
• Who's Who in America ^{美版《名人录》}
• When Scarlet returned to the farm, the old maidservant began to tell her who married whom, who had what children and so on.

It has never been explained why university students seem to enjoy practical jokes more than anyone else.

nobody can explain why ... ^{中式英语（无灵主语是英文写作的要点）}

it has never been explained why ... ^{谁也不能解释为什么...}

• It has never been explained why so many children enter buttonholes in the Flower Show.^{为什么这么多孩子在花展上参加纽扣比赛，还从没人解释过。}
• It has never been explained why Maya civilization vanished from the earth. ^{谁也无法解释玛雅文明为什么会突然从地球上消失。}

特殊疑问词 ... is beyond me. ^{...超过了我的理解范围}

I can't understand / explain why ... ^中式英语

• Why people are prepared to tolerate a four-hour journey each day for the dubious privilege of living in the country is beyond me.
• How Harry managed to keep a straight face during these performances is quite beyond me.
• Why Jane was prepared to marry such a lazy-bones is beyond me. ^{我无法理解Jane为什么愿意嫁给这样一个懒汉.} 

People still have different opinions about whether ... ^{人们对是否……仍有不同的看法【普通句型】}

• Whether the whole universe does so is a moot point at present. ^NCE4-37

It has never been explained why people who live in the Mediterranean seem to enjoy eating octopus more than anyone else. ^{谁也无法解释为什么住在地中海地区的人看似比任何人都更爱吃章鱼} 

Students specialize in a particular type of practical joke: the hoax.

specialize in... ^{专门研究…}

• We specialize in quality furniture. ^{我们专营高档家具。}
• Most of the staff specialize in the care of children. ^{大部分员工都擅长照顾孩子。}
• specialized knowledge ^专业知识
• specialized labour / labor ^{专业的工人}

造词规律

a particular type of practical joke ^{当不可数名词使用}

• practical jokes of a particular type ^{还原成可数}
• The more expensive kind of antique shop where rare objects are beautifully displayed in glass cases to keep them free from dust is usually a forbidding place.
• Antique shops of the more expensive kind where rare objects are beautifully displayed in glass cases to keep them free from dust are usually forbidding places. ^{还原为可数}

Inviting the fire brigade to put out a nonexistent fire is a crude form of deception which no self-respecting student would ever indulge in.

put out = extinquish ^灭火

• put out / extinguish the fire / cigarette / light
• At last, firemen have put out a big forest fire in California.
• When the fire had at last been put out, the forest authorities ordered several tons of a special type of grass seed which would grow quickly.
• I went down immediately, of course, and that fool, Horst, aimed a fire extinguisher at me.

a crude form of ^{低级（粗俗）形式的... form n. a type of sth.}

• a severe form of cancer
• different forms of government
• Swimming is a good form of exercise. ^{游泳是很好的锻炼方式。}
• For John, books are a form of escapism. ^{对约翰来说，看书是一种消遣形式。}
• We need to come to some form of agreement. ^{我们需要达成某种形式的协议。}
• Clothes are a fundamental form of self-expression. ^{服饰是一种基本的自我表现形式。}

no self-respecting ... would do sth. ^{没有有自尊的…愿意做某事（常用于否定句）}

• No self-respecting doctor would refuse to treat a sick person.^{没有有自尊心的医生会置病人于不顾。}
• No self-respecting government would yield to terrorists. ^{没有有自尊心的政府会向恐怖分子低头。}

Cheating in examinations is disgraceful behavior which no self-respecting student a would ever indulge in.^{考试中作弊是一种很不光彩的行为，任何有自尊的学生都不会去做。}

Students often create amusing situations which are funny to everyone except the victims.

Students often create funny situations which are amusing to / amuse everyone except the victims. ^{换一种说法}