Correct
底细
/ dǐxì /
Strokes
Definition
inside information/the ins and outs of the matter/how things stand/what's up
Example
As a Noun
ins and outs; root of a matter
1
Tā
他
bù
不
lexiè
了解
zhè
这
jiàn
件
shì
事
de
的
dǐxì
底细
。
He had no idea about the root of the matter.
2
Mōqīng
摸清
dǐxì
底细
find out the ins and outs (of)