1.
Something that is extensive covers or includes a large physical area.

e.g. ...an extensive tour of Latin America...
在拉丁美洲广泛游历
e.g. When built, the palace and its grounds were more extensive than the city itself.
建成时，宫殿及其庭园比城市本身面积还要大。

extensively
Mark, however, needs to travel extensively with his varied business interests.
然而，马克因为各种生意需要频繁出差。

2.
Something that is extensive covers a wide range of details, ideas, or items.

extensive是什么意思

e.g. Developments in South Africa receive extensive coverage in The Sunday Telegraph...
《星期日电讯报》全面报道了南非的发展。
e.g. ...the extensive research into public attitudes to science...
针对公众科学观的广泛调查

extensively
...the extensively reported trial...
受到全面报道的审判
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。

3.
If something is extensive, it is very great.

e.g. The blast caused extensive damage, shattering the ground-floor windows...
爆炸造成了巨大的破坏，震碎了一楼的窗户。
e.g. 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。

extensively
Hydrogen is used extensively in industry for the production of ammonia.