fill somebody in on the details
给某人提供详细情况
A:I learned of the railway accident only this morning.
A:我今天早上才听说火车事故的事。
B:A really dreadful accident and many people were killed.
B：真是一次可怕的事故，死了很多人。
A:Is that true?
A：真的吗?
B:Yeah, well, I'll fill you in on the details later.
B：是呀，等会儿我告诉你详细情况。
A:Thanks.
A:多谢。