作为副词来讲，deep和deeply都有“深深地，深切地”的意思。
但deep常用来表示具体的深度，而deeply常用于引喻的场合，有时等于“非常地”的意思。
相关介绍
This discussion's getting too deep for me.
这讨论越来越深奥，使我难以理解。
Like many women, deep down she was unsure of herself.
和许多女性一样，她心底里缺乏自信。
She had thought very deeply about this problem.
她曾经对这个问题深深思考过。
They were deeply affected by the news of her death.
她死亡的消息使他们唏嘘不已。
