inquire deeply into;get [probe] to the bottom of (the business);investigate thoroughly;penetrate into (the secret of) origins ;

He is very serious about doing research . He often inquires deeply into the matter.
他研究学问就喜欢寻根究底,很认真的.
来源:互联网摘选The local authorities protect the family from inquisitive tourists.
地方当局保证这个家庭不受爱好寻根究底的旅游者的纠缠.
来源:互联网摘选
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