一、读音与意思
extensive[kstensv]
adj. 广泛的；大量的；广阔的其副词形式为 extensively
intensive[ntensv]
adj. 加强的；集中的；透彻的；加强语气的，特别的
n. 加强，其副词形式为intensively
巧记：首字母e字母排在i字母前面，先要进行广泛的学习，能力就会得到彻底得加强，就会特别。
二、用法
extensive该词强调某事物覆盖或包含大面积的物理区域，或某事物涵盖广泛的细节、想法或项目。如：
an extensive range of wines
各种各样的葡萄酒
Extensive repair work is being carried out.
大规模的修缮工作正在进行。
The fire caused extensive damage.
火灾造成了巨大的损失。
She has travelled extensively.
她游历甚广。
Extensive research has been done into this disease.
对这种疾病已进行了广泛研究。
His knowledge of music is extensive.
他音乐知识很广博。
All these issues have been extensively researched in recent years.
近年来，对所有这些问题都作了全面研究。
Extensive research has been done into this disease.
对这种疾病已进行了广泛研究。
They began to lay in extensive stores of food supplies.
他们开始储备大量食物。
He has carried out extensive research into renewable energy sources.
他已经对再生能源进行了广泛研究。
The facilities available are very extensive.
可使用的设施非常多。
The security forces have extensive powers of search and arrest
安全部队拥有搜查和逮捕的至高权力。
This country has extensive plains. 这个国家有广阔的平原。
He has extensive ideas on this agreement. 在这个协议上，他有广泛的想法。
Tom has extensive knowledge of literature. Tom有广博的文学知识。
2. intensive
该词强调一种需要集中大量精力的活动，或是指有着特定任务的人，为了在短时间内完成大量的工作而密集地、或大强度地做某事。
如：
intensive reading精读 ； 英语精读 ；
technology intensive技术密集型 ；
intensive care重症监护
an intensive language course
速成语言课程
two weeks of intensive training
两周的强化训练
intensive diplomatic negotiations
紧张的外交谈判
His disappearance has been the subject of intensive investigation.
他的失踪一直是大力调查的重点。
This case has been intensively studied.
对这一个案已进行深入研究。
She needed intensive care for several days.
她需要几天的特别护理。
The baby was in intensive care for 48 hours.
婴儿在加护病房看护了48小时。
She spent the night in intensive care after the operation.
手术后的那个夜晚她在重症监护病房度过。
Ruth's parents opted to educate her intensively at home.
露丝的父母选择了在家对她进行集中教育。
There we received several weeks of intensive training.
在那里我们受了几星期的集中训练。
At the beginning of new term, we received several weeks of intensive training. 新学期伊始，我们受了几个星期的集中训练。
Some books are for intensive study and some are for cursory reading.
有的书必须精读，有的只要稍加涉猎即可。
ICU= intensive care unit特别护理病房；重症监护室； 加护病房
如果记住最后这个ICU短语，也就不会再混淆了。
