商品材料归纳在表1中，而表2列出了本研究中制备的改性二氧化硅。

The commercial materials are summarized in Table 1 whereas Table 2 identifies the modified silicas prepared in this work.

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因此，国际贸易以原材料（如小麦、木材和铁矿石）和加工商品（如肉类和钢铁）为主。

International commerce was therefore dominated by raw materials, such as wheat, wood and iron ore, or processed commodities, such as meat and steel.

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购买那些由可循环的材料做成的商品就达到了这个目的。

Buying products made from recycled materials closes the loop.

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