adv.非常；极其
I'm extremely sorry. 我非常非常抱歉。
He knows the area extremely well. 他对这个领域了解的非常透彻。
He is an extremely frank person. 他是个极其老实的人。
It pains me extremely to have to leave you. 不得不离开你，这使我极感痛苦。
