律师在法庭上详细阐述了案件的细节。
The lawyer ___expounded the details of the case in court.
教授花了整整两个小时详细阐述了这个理论。
The professor spent two hours ___expounding on the details of the theory.
教授仔细地解释了这首诗的深层含义。
The professor ___expounded the deeper meaning of the poem to the class.
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