get down go back to grass roots

• 追根究底；发掘事实真相

get down go back to grass roots的用法和样例：

例句

1. Children always dive to the bottom of a subject.
   孩子们对问题总是追根究底的。
2. A patanswer is not going to satisfy an inquisitive audience.
   敷衍了事的答复不会让追根究底的观众满意。