ex.ten.sive.ly Ik5stent7sIv7li adv 广泛地，大规模地 The house was extensively (= a lage part of it was) rebuilt after the fire. 火灾后，这所房子大部分被重建。 The side effects of the new drug are being extensively researched (= are being studied in detail). 这种新药的副作用现被进行广泛的研究。