据南丹麦大学的埃尔维斯·格波·徐介绍，一次性口罩是塑料制品。

According to Elvis Genbo Xu from the University of Southern Denmark, disposable masks are plastic products.

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广西南丹县大厂锡多金属矿田位于广西壮族自治区西北部。

Dachang Tin-polymetallic ore field is located in the northwestern part of Guangxi.

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南丹物资转运站的安全、高效运转是确保龙滩工程建设物资材料保障供应的关键环节。

The safe and high-efficient service of Nandan material transfer station plays an important role to ensure material supply for the construction of Longtan Hydropower Project.

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