However, among the studies, the law educational world only paid more attention to the commodity security and the service security duty which the operators provided.

在对经营者安全保障义务的研究中，目前法学界较为关注的是经营者提供的商品安全和服务安全义务。

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Ad valorem duties are important to those importing goods into the United States of America because the amount of duty owed is often based on the value of the imported commodity.

从价税是很重要的是进口货物进入美国，因为拖欠款额的责任往往是基于价值的进口商品。

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