1. ex- "out" + tens- + -ive + -ly.
2. 含义：stretch out, lengthen.
3. => of or pertain to stretched out.
- 1. Hydrogen is used extensively in industry for the production of ammonia.
- 2. Mark, however, needs to travel extensively with his varied business interests.
- 3. All these issues have been extensively researched in recent years.
- 4. He had worked extensively on the anatomy of living animals.
- 5. They collided on a tight bend and both cars were extensively damaged.
[ extensively 造句 ]