He was always querying subordinates.

他老是对他的部下盘根问底.

辞典例句

Hearings are often very detailed; members of Congress often question closely those officials who spend money.

听证会通常涉及许多细节问题, 国会议员对那些主管花钱的官员往往会盘根问底.

英汉非文学 - 政府文件

Our close questioning had Jim floundering about , catching at straws.

我们的盘根问底使得吉姆心慌意乱,语无伦次, 拼命找救命稻草.

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