delve

He tried to delve inside his memory for clues about what had happened.他努力搜寻记忆，回想到底发生了什么。

Before the trip, I delved into the history of the city.旅行之前，我仔细了解了这座城市的历史。

Now is not the time to delve into the past.现在还不是探究往事的时候。

He delved deeply/further into his research.他对自己的研究进行了深入探索。

He delved in the drawer for a torch.他在抽屉里翻找手电筒。

She delved into her handbag in search of a pen.她在手提包中翻找钢笔。