1. She has read very extensively.
    她博览群书。

2. The machine has been extensively modified.
    这机器已被大规模地改造过。

1. 广阔地：extensive 广大的 | extensively 广阔地 | extensor 伸肌

2. 广泛地,广阔地：extensively 广泛地,广阔地 | intensively 仔细地,详细地,集中地,强化地,密集地 | closely 亲近的,紧密地

3. 广泛地：possess 拥有 | extensively 广泛地 | belong to 属于

4. 广泛的：considerate 照顾周到的 | extensively 广泛的 | diversity 多样性

1. in a widespread way

    e.g. oxidation ponds are extensively used for sewage treatment in the Midwest