Tormented by her ignorance, Jenny delves into her mother's past. [VERB + into]

珍妮为自己的一无所知而苦恼，开始探究起母亲的过去。

If you're interested in a subject, use the Internet to delve deeper. [VERB adv.]

如果对某一主题感兴趣，就上网进一步深入研究。

She delved into her rucksack and pulled out a folder. [VERB prep./adv.]

她在背包里翻找一番后拿出了一个文件夹。