专家讲解有关中国的保健食品及药品的法律法规。
Experts explaining the laws and regulations on China's health food and drug.
他们在听专家讲解，她是史密斯松宁主管陨石的专家。
They were listening to an expert who is in charge of meteorites at the Smithsonian.
他们在听专家讲解，她是史密斯松宁主管陨石的专家。
They were listening to an expert who is in charge of meteorites at the Smithsonian.
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